The cast of Master of Martial Hearts. Due to The Reveal in the last episode, all spoilers are unmarked.
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Main Characters
Aya Iseshima
The heroine of the series. A second-year student, she is best friends with Natsume Honma and has a crush on her brother, Hazuki. She is entered into the Platonic Heart tournament in place of Miko. A very capable fighter who learned from her mother, she can go into a rage and destroy her opponents.
- Bully Hunter: Aya once took on and defeated an entire school of bullies, single-handedly, and in a single battle, presumably for Natsume's well-being. Ironically, this made her feared by the other students and is precisely what makes her easy prey for the plot of the series.
- Cat Girl: Aya out-
Moes the Meido with a costume that adds cat ears and tail. - A Friend in Need: She gets herself mixed up in the tournament after deciding to help out Miko, entering for her so she doesn't have to fight anymore.
Natsume Honma
Aya's best friend. Unlike Aya, she is not a fighter, and is mostly clueless about the tournament, but wants to support her friend.
- Bitch in Sheep's Clothing: Aya's best friend foreverr is actually a revenge-obsessed bitch willing to trample, maim, and Mind Rape a whole bunch of innocent women and girls just to screw with Aya. The whole time faking friendship towards her just to rub it in her face during The Reveal.
- Co-Dragons: With Miko and Haruki, to Kumi.
- The Dog Was the Mastermind: Aya's optimistic best friend who supports her all the way and seems to be clueless about the Platonic Heart tournament is actualy one of the masterminds behind the tournament.
- Knight of Cerebus: In episode 5, The Reveal of what she and her co-conspirators have been doing behind the scenes of the Platonic Heart tournament takes the series into surprisingly creepy territory and sets up the surprisingly dark ending.
- Love-Interest Traitor: She had quite a bit of Homoerotic Subtext with Aya, but is one of the masterminds of the Platonic Heart tournament and has conspired to turn her into a Sex Slave as Revenge by Proxy on Aya's mother, who subjected her mother to the same fate.
Haruki Honma
Natsume's brother, whom Aya has a crush on.
- Co-Dragons: With Natsume and Miko, to Kumi.
- Distressed Dude: He gets held hostage by Rei, tied to a pole with chains, to force Aya to fight. Subverted when he is revealed as one of the masterminds, so he was likely not in any danger.
- The Dog Was the Mastermind: Aya's sweet Love Interest who seemed to have nothing to do with the Platonic Heart tournament is actually one of the masterminds behind the tournament.
- Knight of Cerebus: In episode 5, The Reveal of what he and his co-conspirators have been doing behind the scenes of the Platonic Heart tournament takes the series into surprisingly creepy territory and sets up the surprisingly dark ending.
- Love-Interest Traitor: Aya had a crush on him for the whole series, but he is one of the masterminds behind the Platonic Heart tournament and has conspired to turn her into a Sex Slave as Revenge by Proxy on Aya's mother, who subjected his mother to the same fate.
Miko Kazuki
A shrine maiden who encounters Aya and Natsume while fighting Rei. She was initially participating in the Platonic Heart tournament for the wish to make friends, but when Aya and Natsume befriend her, she decides to withdraw and let Aya participate instead.
- Co-Dragons: With Nastume and Haruki, to Kumi.
- The Dog Was the Mastermind: Faux Action Girl Miko, the cute, helpless strange girl and cuddly and cheerfully friend in need who drove Aya to enter the tournament to protect her and seemed to dissapear after one episode, was really one of the masterminds behind the Platonic Heart tournament.
- His Name Really Is "Barkeep": She is a miko who happens to be named Miko.
- Hypocrite: Miko blames Aya for destroying the other contestants' lives and minds after defeating them...when she and the others were the ones who literally Mind Raped them to idiocy after they were too weak to defend themselves. And also reconstructed, or simply exploited, said tournament for vengeance in the first place.
- Knight of Cerebus: In episode 5, The Reveal of what she and the Honma family have been doing behind the scenes of the Platonic Heart tournament takes the series into surprisingly creepy territory and sets up the surprisingly dark ending.
- Miko: Who happens to be named Miko.
Supporting Characters
Suzuko Iseshima
Aya's mother, who was the previous winner of the Platonic Heart tournament.
- Death Equals Redemption: She decides to stay inside the burning building and die to pay for having participated in her husband's Sex Slave scheme.
- The Dog Was the Mastermind: Aya's quirky mother is actually one of the Greater Scope Villains of the series, as she helped her husband build the first Platonic Heart tournament.
- Greater-Scope Villain: She and her husband built the first tournament and made Kumi a Sex Slave when she lost, which drove her to become the Big Bad and rebuild the tournament to take revenge on her. She mostly stays in the background, though, and never antagonizes Aya, instead helping her.
- Mama Bear: She breaks into the building and kills Miko, Nastume, and Haruki to save Aya from them.
- Obfuscating Stupidity: She remains just as lethal and unforgiving as stated, despite it being years since she had to fight, and she acts goofy to keep up the illusion.
- Retired Monster: She helped her husband run the Platonic Heart tournament and got women turned into Sex Slaves, but has retired since then and is remorseful for what she did.
Shigeyuki Iseshima
Aya's father, who created the first Platonic Heart tournament.
Kumi Honma
The mother of Natsume and Haruki.
- Big Bad: She is the true mastermind of the Platonic Heart tournament and the one behind the scheme to turn women into Sex Slaves, particularly Aya, as Revenge by Proxy for her parents doing it to her.
- Bitch in Sheep's Clothing: Natsume's Cute Mute mom, secretly a Stepford Smiler, deeply inside, a raging beast that, due to having catastrophically lost her voice, mental sanity, and freedom because of Aya's mom when both of them were plucky Action Girls (and she actually tried to kill her opponent's parents, it seems...), masterminded the whole convoluted plot, pressuring her offspring and their cousin Miko to send dozens of young girl to the same fate as her just to ensure Aya was reeled in.
- Cute Mute: Your average MILF, caring and lovely. Mute due to an unspecified accident in the past, she communicates by Sign Language, using her kids as a proxy. Subverted as her unspecified accident gets revealed. She's a former Action Girl, who after losing a Street Fighter expy tournament got her voice box torn out, her personality mindraped into total obedience, AND was sold into sexual slavery. Since then, her whole life had been an attempt to regain a semblance of normality and hatch a complicated Revenge by Proxy involving her offspring and protagonist Aya Iseshima, who is the daughter of her captors.
- The Dog Was the Mastermind: Nastume and Haruki's Cute Mute mom who appeared in two short scenes is revealed as the true Big Bad behind the tournament.
- Evil Cripple: She is mute due to having her voice box ripped out and is the true leader of the Platonic Heart tournament, turning the losers into Sex Slaves so that they can suffer through what she did.
- Evil Matriarch: She is the mother to Natsume and Haruki and raised them to be her Co-Dragons in her revenge scheme against Suzuko, Aya's mother.
- Knight of Cerebus: In episode 5, The Reveal of what she and her Co-Dragons have been doing behind the scenes of the Platonic Heart tournament take the series into surprisingly creepy territory and sets up the surprisingly dark ending.
- The Man Behind the Man: The fake Haruki, the supposed leader of Platonic Heart, and Miko Kazuki both answer to her.
- Non-Action Big Bad: She leaves the fighting to the competitors and has her children and Miko take out Aya in the finale. When they are all defeated, Aya quickly kills her.
Takumi Yoshida
Aya's perverted physical education teacher.
Platonic Heart
Leadership
Leader of Platonic Heart
The Fake Haruki
A man who resembles Haruki and is the frontman of the tournament. He surgically engineers his appearance to manipulate girls. He is actually working for the real masterminds, Kumi and her group.
- Big Bad Wannabe: He tries to betray Miko and the Honma family so he can take control of Platonic Heart for himself, but gets killed by Haruki.
- Boom, Headshot!: How he dies.
- Disc-One Final Boss: He is the official leader of Platonic Heart and appears to be the antagonist, but is actually working for Kumi and her Co-Dragons.
- Even Evil Has Loved Ones: When Izumi, his assistant, is killed, he screams her name and gets furious at Haruki for killing her.
- The Starscream: He betrays Miko and has Izumi strangle her so that he can take over Platonic Heart and have Aya to himself.
Izumi Hayakawa
A woman in a white suit who works for the Fake Haruki.
- The Dragon: To the fake Haruki.
Contestants
Rei Kakizaki
A flight attendant and the first competitor faced by Miko and Aya.
- Sexy Stewardess: She is a flight attendant and, being in a Panty Fighter series, just as attractive as the other competitors.
- Warmup Boss: She is the first opponent Aya faces in the tournament.
Azusa Suma
Aya's chemistry teacher and the second opponent she faces.
- Aloof Dark-Haired Girl: Looked up to by her students.
- Apologetic Attacker: She telegraphs all her moves, by calling out chemical formulas (her armor has chemical symbols on it), while she begs Aya to either block or stay down. If only Aya studied her chemistry textbook...
- Hot Teacher: Is a chemistry teacher and, being in a Panty Fighter series, is just as attractive as the other competitors.
Megumi Shimoyama
A mechanic who fights Aya in the beginning of episode 3.
- Wrench Wench: She uses wrenches as her weapons.
Daimonji Sisters (Emi, Yu, and Saki)
A trio of sisters who work as a nurse, police officer, and geisha respectively, and are part of the alliance that manages Platonic Heart. They help carry away the losers.
- Battleaxe Nurse: Emi works as a nurse and is a Hospital Hottie, but also happens to be a fighter in the tournament and is in charge of making the losers "disappear".
- Fair Cop: Yu is dressed in a cop outfit that bares her midriff.
- Hospital Hottie: Emi is a nurse who wears a sexy nurse outfit.
Rin Hiroishi
An idol singer/maid who faces opponents inside her cafe.
- Crippling Overspecialization: She made it to the Semi-finals because of her stress-based tactics. Apparently she had every fight inside of her shop, and was able to use an otaku crowd and their jeers to stress her opponents out so she could over-power them. When Aya over-comes this and turns the tables, we see Rin's physical prowess is much less than many previous villains like the Sisters.
- Flat Character: The sum total of her characterization is "idol singer". Some 50% of her lines are just her singing her Image Song.
Getsurei Ryu/Yulei Liu
A mysterious psychic woman in red who is the final opponent Aya faces in the tournament.
- But Not Too Foreign: Half-Japanese, half-Chinese.
- Fortune Teller: How she makes a living.
