Being the main character of the Light Novel series, Ichika has encountered many people along the series, be it with family, friends, or enemies.


Chifuyu Orimura

Ichika and Chifuyu1

Young Chifuyu and Ichika.

His older sister, homeroom teacher of Class One, and 1st year dorm supervisor. Originally a legendary pilot of the 1st generation IS, she took care of him after their parents had abandoned them. Despite the harsh treatment he regularly gets from her, Ichika still loves her deeply. She was the one who transferred him to the IS Academy to ensure that he would be safe from the government.

Ichika and Chifuyu2

Young Ichika and Chifuyu in their formal uniform.

Although he does not remember much of the events that transpired during his kidnapping, it was his sister who came to save him when he was young. Though grateful, he still feels deep regret over the incident as it cost Chifuyu her title, showing how much respect he has for his sister’s pride and reputation. As seen or stated, Ichika is willing to give his life to protect her at all costs.

Ichika and Chifuyu3

Ichika and Chifuyu after the first Mondo Grosso.

They both share a common desire to protect one another, acknowledging that they are the only family the other has. At home, the relationship between the two is more casual, as Ichika does all the housework while Chifuyu is working and would give her massages to help her relax. While Ichika thinks this is normal because they siblings, the other girls think they look more like a married couple than brother and sister, something they are envious of[1]. They are even worried that Ichika might have a sister complex towards Chifuyu.

Madoka Orimura

His younger twin sister. She holds a grudge towards her older sister, Chifuyu. She is similar in appearance to Chifuyu. She is the IS pilot of Silent Zephyrs and a member of Phantom Task. Both have clashed against each other numerous time in battle. When she reveals her true identity to Ichika in the end of Volume 6, he begins to question the forbidden topic about family. It can be assumed that she's at least aware that Ichika doesn't know who she is given the fact that she introduces herself to him. Madoka despises him for some reason and came close to killing him in Kyoto with her new IS Kurokishi, but was stopped when the Shirokishi took control of his body[2]. After this, Ichika comes to accept that Madoka is his enemy and resolves to fight her when the time comes[3].

Childhood Friends (Normal) and Family-related people

Dan Gotanda

His good friend from middle school. He is often mentioned by Ichika that he wants to switch places with him to enjoy "paradise" in the IS Academy.

Ran Gotanda

Dan's younger sister. She has a crush on him.

Kazuma Mitarai

Another friend from middle school. He appears in Volume 5.

Tabane Shinonono

Houki's older sister. Tabane calls him affectionately as Ikkun (Short for Ichika-kun), and he has a mutual respect for her, though he too is somewhat overwhelmed by her explosive energy. However, he has become increasingly cautious around her due to her involvement with Phantom Task[4].

IS Academy

Being the only male student at the academy, Ichika is usually the center of attention there. Almost of the student are interested in him and become excited at any chance to be around him. They can sometimes be very demanding of him, wanting him to treat them like he usually treats the main girls and gets upset when he refuses to do so. Most of the girls his year are completely comfortable around him, not even having a problem being in situation where he could see them in their underwear or touch their body's.[5] The older students are even more bolder, coming even off as seductive and flirty.[6]

Main Heroines

Infinite Stratos volume 10 color 1

Ichika giving the main girls a oil massage.

The closest friends Ichika has made at the Academy would be with all the personal IS pilots of his year as well as Tatenashi. Although Ichika got off on the wrong foot with most of them (which were never his fault to begin with), Ichika's steadfast and noble personality won him their heart, something everyone but him notice. After that, they would try to spend as much time with him as they can, usually under the excuse of helping him get better at piloting the IS. However, Ichika failed to understand this and end up spending time with as a group (which made them closer to one another).

While the girls all love him and have become very close friends with each other, they're always quick to get jealous whenever he seems to be giving any one of them (or another girl) more attention then the rest of them, which they react with violence, ironically making them more of a danger to his life than his actual enemies. This usually results in them demanding him to 'repay' them in some way. Despite this, they do value his life, which was clearly shown after Ichika was killed by the Excalibur protecting Cecilia, as they were all utterly devastated. After he was revived, they were all extremely relieved and overjoyed to see him alive again[7].

Houki Shinonono

His 1st childhood friend and a classmate in Class One. They used to train in kendo when they were young. About six years before the current storyline, Ichika agreed to become her boyfriend if she won the national kendo tournament of their grade. He told her that he was glad to be her roommate, as he was worried about sharing the same room with a total stranger. Ichika, due to his nature, sees Houki as an extremely strong childhood friend of his. He is willing to do things for her that he probably might not do for others. However, before the events of the Shinonono festival (which takes places sometime after the events of Season 1, Episode 12), they had practically dated and nearly kissed, implying that he may have some sort of emotions regarding Houki. Unfortunately, Ichika's kiss is comically obstructed by Cecilia, Rin, Charlotte, and Laura, causing him to run away while carrying her in his arms with a comical worried face saying "he is going to die".
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Ichika and Houki almost kissing during a photo shoot (if they were alone and that's what happens in Houki's mind).

In addition, during the episode of "Lovely Style," he is well aware of the attractiveness of the heroines. However, during Houki's turn, there is a moment where they feel a "spark" between them, but they are interrupted by Yamada-sensei. Also in the light novel, his inner monologue during their photoshoot after their interview with Nagisako indicates that he realizes Houki's beauty when she's all dressed up, to the point where he said it was intoxicating. Another example can be seen in Volume 8, while Ichika was annoyed by the other girls' delusions of him, but he seems more jealous by how much better Houki treated the fake Ichika than she ever treated the real him.

Houki loves Ichika to the point where she managed to muster up enough courage to confess to him at the Shinonono festival. However, right when the words "I love you" were said, fireworks exploded, rendering her words inaudible. Her emotional state is also somewhat dependent on her relationship with Ichika, as shown when Akatsubaki's One-Off Ability was activated after excessively thinking about him. Additionally, when he was injured while saving her life by taking a blast meant for her, she was so depressed that she nearly stopped piloting her IS altogether.

Cecilia Alcott

Ichika Cecilia cooking

Ichika helping Cecilia cook by overlaying his hand over hers

His classmate in Class One and the IS Representative Candidate of England. She challenges him to a representative duel as she believes it to be biased. After giving her a hard time in the duel, she soon starts to see him as a true man and falls in love with him, calling him affectionately as "Ichika-san," much to his confusion and Houki's displeasure.

Ichika sees Cecilia as a fellow student and a good friend on most occasions. Of course, the comical and awkward scenes that have involved her before may imply something beyond the boundaries of friendship. Of course, this is completely unconfirmed. They are on relatively good terms, which most likely means that Ichika does not care about the prior incident when they dueled for the position of "Class Representative". Ichika even gave her a massage to make up for not being able to feed her, something she found blissful. Over time, Ichika has come to see Cecilia as a very beautiful young woman and a dear friend.
Infinite Stratos volume 11 Ichika Cecilia

Ichika hugging Cecilia on her birthday.

By volume 11, there have been hints that Ichika has started seeing Cecilia in a romantic light, which makes the other girls extremely jealous had how close the two have become. He shows strong concern for Cecilia and doesn't hesitate to go with her back to England after Chelsea's strange actions. While around her, he shows concern yet sometimes be a little teasing. During Cecilia's birthday party, Ichika acts more intimate and a little bit more mischievous towards her. At her request for her birthday present, Ichika embraces Cecilia.

In Volume 12, their relationship was shown to be a bit more romantic as Ichika showed no hesitation or embarrassment in regards to feeding her a parfait or complimenting her on her "curves"

Cecilia is in love with Ichika to the point of fantasization. While it has happened with all the main heroines of the series, it is undeniable that Cecilia is no exception. Her love for him is a little shallow, but it is love nonetheless, and she puts in as much effort as the rest of the girls.

Lingyin Huang

His 2nd childhood friend, who is the IS Representative Candidate of China and Class Two. She's has been in love with Ichika since he protected her against four school bullies. Ichika sees Rin as a really good childhood friend, and this is shown when she is first introduced. He addresses Rin without any other proper honorifics, which shows his good relationship with her. When they are eating together in the cafeteria during this time, they have already engaged in a very deep and long-winding conversation.

Rin has loved Ichika for quite some time already, and this is shown when she mentions the promise they made to each other when they were much younger. Notably, she and Cecila Alcott share a similar trait of a yandere girlfriend. This is first shown when Charlotte and Ichika went to the mall by themselves.

While Rin meant for them to become a couple, Ichika had interpreted the promise (with his usual blockheadedness) as getting free sweet and sour pork every day on Rin's behalf. In fairness to Ichika though, the promise was phrased as "If I become a better cook, would you eat my sweet and sour pork every day?"

However, he does seem to have some feelings for her, as in Side Story 3, Lingyin manages to convince Ichika to dry her bare breasts with a towel, while for all other girls, he had instantly refused to even dry their backsides.

Charlotte Dunois

The IS Representative Candidate of France. She was sent as a spy by her father to figure out how Ichika can pilot an IS. After her transfer, she becomes Ichika's roommate where he later discovers her true gender. Upon learning that Charlotte's father and his corporation used her to spy on him, Ichika decides to help and protect her, being reminded of his own history with to his parents.
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Charlotte hugs Ichika.

When they first meet, Ichika was under the impression that all the other students were under, which was that Charlotte was a male student known as Charles. During that time frame, Ichika was on extremely close terms with Charles/Charlotte due to his lack of male contact. During the very first day, they had already established a very close friendship.

After the discovery of Charlotte's/Charles' true gender, Ichika's opinion and friendship towards her is completely unwavered. Although some events happen between them that are undeniably awkward, they have maintained an extremely good relationship. Ichika even gives Charlotte a nickname for just the two of them (Charl).

The two are extremely good partners during IS battles for some reason, as shown when they coordinate their attacks extremely well during the match with Laura and Houki. Additionally, Charlotte is able to transfer energy over to Ichika's IS, which is something that is initially fairly (if not highly) difficult to do. This already proves how close they are.

While Ichika views Charlotte as a very good friend and a powerful companion, Charlotte has undeniably fallen in love with the dense Ichika. Her very mannerisms are extremely flustered when around him, and this merely proves that she has very intense feelings for him. While Charlotte is no doubt the gentlest and most forgiving of the harem, she has also shown herself to be extremely scary. This is shown when she gets mad at Ichika for whatever reason, and Ichika's inner monologue has described her smile as more scary and demonic rather than the kind and angelic one it usually is.

Laura Bodewig

The IS Representative Candidate of Germany. Laura comes to the IS Academy to punish Ichika as she blames him for his sister withdrawing from the IS International Fighting Tournament, Mondo Grosso, in order to save him when he was kidnapped in the past and denying Chifuyu the right to win.
Laura kisses Ichika

Laura kissing Ichika.

Ichika first had a fairly negative impression of Laura, as she had practically attempted to nearly kill Rin and Cecila in what was supposed to be a mock battle. However, after discovering that she looked up to Chifuyu greatly, and also had similar issues to any other normal person, he treated her with kindness and friendship regardless. He trusts her like he would trust any of the other girls at school anyway. Afterwards, he starts considering her a woman, even calling her "cute" when Chifuyu questioned him on his feelings for her.

Laura's first impression of Ichika was far more negative than the latter's. Believing Ichika to be a hindrance to Chifuyu's image in Laura's eyes, Laura did not like him at all. However, after Ichika saved her from her mutated IS, they seemed to have shared a brief moment of conversation before she had fallen unconscious. When Laura saw that Ichika's characteristics were also extremely similar to that of Chifuyu, it's safe to assume that she had decided to fall in love with him right then and there. As time progressed, her feelings for him deepened to the point she started acting like a typical girl in love, even becoming very shy from happiness when Ichika holds her or compliments her looks.

In volume 9, it is implied that he has started to see her as a woman, even inviting her out for drinks without a good reason. Before getting killed by the Excalibur, Ichika had trusted Laura to handle the rest. While Laura resents him for it (as it robbed her of the chance to mourn his death), it allows her to stay focus when both Houki and Lingyin had already fallen into shell shock, thus she is still devastated and wants revenge against the Excalibur for killing Ichika.

Tatenashi Sarashiki


Tatenashi let him on Ichika to rest in her lap

IS Volume 5 Tatenashi push down Ichika

Tatenashi teasing Ichika with her body

The Student Council President in the IS Academy, the IS Representative Cadet of Russia and the head of the Sarashiki family. She is his bodyguard, his third roommate, and often creates mischief for him. He usually doesn't like her company because she always ends up teasing him. But when it comes to important matters (such as Phantom Task or family), they talk to each other more seriously, although she will usually break the atmosphere by teasing him or playing a prank. But when Ichika talks about her, she does it with respect and she praises it. Another part of the reason why Ichika is uncomfortable around Tatenashi is because she sometimes gets too physically close to him with her very voluptuous, mature body (Ichika often states that Tatenashi's figure is good, and not just good, but really outstanding). She also teases him with it by dressing scantily in front of him and demanding that he massage her whole body, which Ichika considers 'dangerous' for a young man like him. Ichika thinks that her body feels great to touch and it feels good to massage it. Also, when Tatenashi asks him to massage her butt, Ichika does not oppose and really likes the feeling of it, having a nosebleed while doing so.[8][9]

Throughout Volume 6, it is shown that she is becoming more mindful of Ichika, even thinking of him on random occasions. In the episode of "Lovely Style", Ichika she sees it on Tatenashi that Neko Cat he was a little shy he looked a little more at her feminine parts unlike the other girls and when Tatenashi tells him that his Ichika that gets serious it seems to be becoming more affordable and seems that a moment has arisen between them special but it was interrupted of Lingyin. While she doesn't mind teasing him or putting him in a situation he doesn't want to be, she has complete trust in him. In Volume 7[10], she even asked him to partner with her little sister Kanzashi when she was having trouble getting along with her (when Kanzashi goes to Ichika's room, he sees it with his big sister Tatenashi though he sees them for a short time, she affirms "Both of them seem to have quite the good relationship."). This ends up with the two sisters finally making up with each other at the end of Volume 7[11]. Afterwards, she questions herself on why she asked him in the first place and admitted to herself that she wanted to flirt with him, blushing as a result.

Also, their relationship and feelings for each other are deeper in Volume 8[12] when Tatenashi is shot in the back by an American soldier, she mutters his name before falling unconscious. In the research room, Ichika, who had his IS in open mode, hears his name in his mind and goes to save Tatenashi, indicating it means that a special bond was formed between them. After Ichika saves Tatenashi from being kidnapped by the American special forces, she reveals her true name, (更識 刀奈 Katana Sarashiki), to him while they were in the Academy's infirmary, which has a special significance in the Sarashiki family, indicating that a certain level of affection has grown between them (at least from her side; also Ichika is happy that knew a little bit more about her). She also exhibits a jealous reaction towards Ichika after mentioning the lewd exploits of the fake Ichika and the other girls. This suggests that she does feel the same way the main harem does since she asks him to do similar things to her as well. Even the manner in which she asks him do it is also different from the way she used to do it before; in a shy, nervous tone compare to her previous playful, straightforward one. She also has him call her by her real name when they're alone[13].


Tatenashi and Ichika to the Academy's infirmary

In Volume 9, their respective positions in the relationship become reversed. Ichika is no longer uncomfortable about being close or intimate with her and even takes the initiative to see her, even without a good reason. While Tatenashi herself becomes shy about Ichika and is the one who is constantly confused about their relationship. This in turn causes them to behave more like a real couple, which more than a few people point out. She, however, is initially not entirely in favor of this development, noting the value in her duty and reminding herself that falling in love is the only thing she can't do, only to fail to deny it when questioned about it by Chifuyu[14]. She changes her mind after their 'evening' together, by realizing that when she is by his side, she isn't Tatenashi, head of the Sarashiki family, she is only Katana. She's even willing to consider marrying him[15] and using her authority as the IS representative of Russia to smuggle Ichika to Russia should it be necessary[16].

His feelings for her are on a much deeper level compared to the other girls. He purposefully makes Tatenashi lunch made of her favorite foods and subsequently insists on feeding it to her. He is even perfectly calm and decisive about touching her body and complimenting her on it. He even compliments her on features that the other girls don't have[17]. He can always recognize when she is facing difficulties or is trying to deflect him. He is very interested in talking about Russia after imagining Tatenashi wearing a long fur coat and hat. He even asks her if he can go with her one day to Russia, only the two of them. And she is even able to pressure him into calling her his girlfriend in public[18].

Kanzashi Sarashiki

Tatenashi's younger sister. The IS Representative Candidate of Japan and Class Four. He asks her to be his partner during the tournament at the IS Academy (Tatenashi asked him to do it). Since people usually are not nice to her, she takes it as a bad joke and slaps him. After that event, she starts to fall for him, so she finally accepts his petition.

Her feelings for him seem to be connected to her love for heroes. As such, she views Ichika as her hero (someone who will always be there for her and protect her). At the end of Volume 7[19], she confesses to him. But because they were talking about anime, she believes (which is most likely true) that Ichika thought she means anime and not him. She behaves like the other girls who love him do, shy when he compliments her looks, but will become angry with him when he compliments another girl.

However, her love for Ichika has changed her on a deeper level. She is no longer reserved and shy about Ichika and she continually schemes both with and against Tatenashi on reducing the amount of contact he has with other girls.


Maya Yamada

IS Volume 2 Maya breast CHOCO

Ichika accidentally gropes Maya's breast, making him completely aware of them afterwards

His assistant homeroom teacher in Class One and a former IS Representative Candidate of Japan. They have mutual respect for each other. Even when Ichika accidentally gropes Maya's breast during an IS demonstration, the latter does not seem to be too much bothered about it (though she started daydreaming about the possibility of being Chifuyu's sister-in-law). The two would often find themselves in similar situations when they are training due Ichika being in positions where he ends up noticing her large bust through her IS suit. Even during casual conversation, Ichika would find himself looking at her breast whenever they jiggle. Maya doesn't get angry at Ichika like the girls would, understanding he's a young man, thus she's often slow to notice.[20] When Ichika end up entering the mixed bath where Maya and Chifuyu were bathing nude, Maya didn't get angry at Ichika but was still surprised by his appearance, with both of them clearly flustered to have seen each other naked. Maya also helped Chifuyu hide him from the other girls using their body's.[21]

Unlike Chifuyu, Maya tends to spoil Ichika at time and would take his side in matters. This includes hosting host a contest for his birthday wearing she, the main girls and Chifuyu wore revealing outfits for him[22] and getting the 1st year personal pilots to serve him as geisha[23].

Students (including classmates from other years)

Honne Nohotoke

Volume 10 Ichika Honne

Honne comforting Ichika

The two seem to get along with each other, even before Ichika was forced into the Student Council. Ichika even recognizes her more out of all the other girls in the school outside of the girls he's usually with. His opinion on Honne is mainly on how she does almost everything at her own slow pace. Having gotten used to seeing her in her usually baggy clothes, he somewhat surprised by how well-endowed she really is. Honne doesn't seem to mind being seen naked (or a least in her underwear) by Ichika.

In volume 10, Honne won the rights to sit next to Ichika on the train ride to Kyoto[24], where she enjoyed clinging to him the entire ride, much to everyone's jealousy. In order to get away from everyone crowding him, Ichika and Honne flew away and end up in a play. After getting away from that, Honne took the time to point out to Ichika how he's always there for all of them but didn't ask for the same from them. This ends up surprising Ichika as he cried. Honne comforted him by telling Ichika he could let them help him too[25]. After this, the two were growing closer even outside of the Student Council, something that worried the Sarashiki sister, especially after seeing him buy Honne a gift in a very casual manner[26].

Kaoruko Mayuzumi

A second year and the Vice-President of the Newspaper Club. Being the only male student in the Academy, Ichika has gotten interviewed by Kaoruko more than a few times. Because of this, Ichika has gotten used to Kaoruko. In order to complete Kanzashi's personal IS, Ichika asked Kaoruko for help and agreed to her terms (going on a date with her). He's often bothered by her teasing.

Utsuho Nohotoke

Honne's older sister and a fellow member of the Student Council. Due to her more mature and straightforward personality, Ichika would ask her for advice when it comes to Student Council work or dealing with Tatenashi. Unlike the majority of the students at the Academy, Utsuho never expressed or showed interested in getting closer to Ichika for being the only male there. Instead, she end up dating his best friend Dan.
Infinite stratos volume 12 ichika princess

Ichika and Airis sleeping together.

Airis Twilight Ruxezemburg

The Seventh Princess of Luxembourg who first appears in Volume 12. She quickly took a interest in Ichika after first meeting him and had him escort her while she was in Japan, not giving him the choice to refuse. During their first week together, she kept ordering Ichika to do stuff for her whenever she felt like it. While Ichika found her to be a selfish little brat, he still did as he was told until it became natural for him. By the end of the first week, the two started warming up to each other, with Ichika beginning to see Airis as like a little sister, even giving her a nickname (Alice). Airis also started developed feelings for him and wanted to bring him back with her to her home country, which strengthen after he saved her from a kidnapping[27].

IS Pilots

Natasha Fairs

The IS Representative Candidate of USA and the pilot of the Silver Gospel. She appears at the end of Volume 3 (does not appear in the anime) when she walks onto the bus (taking the IS Academy students back from their field trip) to look for Ichika. She is grateful to him for saving her from the control of the unit and kisses him on the cheek as her way of thanking him, unknowingly getting him into trouble with the girls. After kissing Ichika on the cheek, she leaves the bus and talks to Chifuyu, only to blush when the latter complains about her kiss, which has created unnecessary sparks.

Civilians from outside

Chelsea Blankett

Cecilia's maid and childhood friend. He first meets her in Volume 4 with Cecilia as his companion. The latter begins to suspect the rumor that 'Ichika likes older women' based on the former's interactions with Chelsea. Unknowingly, this results in Cecilia pondering on the possibility of becoming an older woman to attract Ichika's attention. After the Excalibur incident, Chelsea is grateful to Ichika for saving her younger sister Exia, as well as them[28].

Phantom Task

Squall Meusel

The leader of the Phantom Task squad that Madoka and Autumn are a part of. The two first meet at the restaurant that Ichika and Houki were given free dinner tickets for. Since Ichika can't enter the restaurant without a formal outfit, Squall gives him one so he can enter because she feels satisfied helping someone in need. This leaves him charmed by both Squall's beauty and grace. However, he becomes confused when she says his name, even though he didn't tell her. He later learns that she's a member of Phantom, which leaves Ichika feeling more cautious of her when he meets her again while shopping, though he still acts polite towards her. This doesn't bother her much and she warns him to be careful around his older sister and the Kuramochi Engineering's plans before leaving, causing Ichika to feel suspicious about the two[29].


A member of Phantom Task and the one responsible for kidnapping Ichika during the 2nd Mondo Grosso.

Alicia Jiosestaf

The second winner of the Mondo Grosso.


  1. LN Vol 4 Ch 4
  2. LN Vol 10 Ch 3
  3. LN Vol 11 Ch 3
  4. LN Vol 11 Ch 3
  5. LN Volume 8 Ch 1 & Infinite Stratos season 2 episode 10
  6. LN Volume 9 Ch 1
  7. LN Volume 11 Ch 4
  8. LN Volume 5 Ch 2
  9. Anime Infinite Stratos 2 Episode 2 & 3
  10. Anime Infinite Stratos 2, episode 7 and 8
  11. Anime Infinite Stratos 2, episode 9
  12. LN Volume 8 Chapter 3 & Infinite Stratos 2 OVA: World Purge-hen
  13. LN Volume 8 Ch 4
  14. LN Volume 8 Ch N
  15. LN Volume 8 Ch N
  16. LN Volume 9 Ch 4
  17. LN Volume 9 Ch N
  18. LN Volume 9 Ch 4
  19. Anime Season 2, episode 9
  20. LN Volume 6 Ch 3
  21. LN Volume 10 4
  22. Anime Season 2 Episode 5
  23. LN Volume 10 Ch 5
  24. LN Volume 10 Ch 4
  25. LN Volume 10 Ch 5
  26. LN Volume 11 Ch N
  27. LN Volume 12 Ch 1
  28. LN Vol 11 Epilogue
  29. LN Vol 10 Ch 3

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