Chiaki Koizumi

^{Click here to see her in her GA Uniform.}

The comic's main protagonist. She is an awkward, shy, otaku girl who has a crush on her best friend Fumiko. When she sees Fumiko and her boyfriend Kenta quarrelling, she tries to break up the fight but then finds herself transported to another world.

• Boyish Short Hair: Chiaki has pretty short hair, though it used to be a lot longer in the past.
• Blow You Away: It is revealed at the end of Chapter 2 that she is Wind-aligned. The beginning of Chapter 3 reveals that she decided to stay unsealed. Though she still doesn't know how to use her powers.
• Cannot Spit It Out: She longs to confess her feelings to Fumiko, but her extreme awkwardness prevents her from even starting a confession, let alone finishing one. One time she even learned to make sweets to try and confess to her, only for Fumiko to ask her current boyfriend out first and causing her to throw them out. The only time she manages to confess it turns out to be a dream.
  Fumiko: Who do you like Chiaki-chan?
  Chiaki: Huh? I...I like...bread.
• Genre Savvy: Chiaki can recognize several fantasy concepts/Tropes due to being an otaku. For example, after getting transported to The Other World, she notes that she's "seen anime like this" before, with Fushigi Yuugi coming to mind for her.
• Girlish Pigtails: Chiaki used to wear her hair like this, until she decided to shorten it for unstated reasons.
• Heroic BSoD: When she wakes up to discover she's in another world, with no apparent way to get back, she breaks down in tears.
• How Do I Shoot Web: Has little idea on how to use her abilities.
• Innocently Insensitive: When Nagisa says that she's trans, Chiaki, who is from the very early 2000s before the term became more widely known, has absolutely no idea what the term is referring to. She's not unfamiliar with the concept since someone who works at a store her mom goes it to is a trans woman who transitioned when Chiaki was a kid, but her confusion causes Nagisa to get flustered and run off.
• Otaku: With her geeky love of anime, manga, and video games, Chiaki is this trope to a T.
• Trapped in Another World: Chiaki gets knocked unconscious after falling headfirst into the school gate, and when she wakes up, she finds herself in another world, with no discernable way to return to her homeworld.

Nagisa Tadashii Labrie

• All Girls Want Bad Boys: Same-sex variant, when Micah suggests that she'd like to see Chiaki in a hot thief outfit after she mopes at Chiaki talking to her fellow Unbound in the Bastards, Nagisa has an Imagine Spot where her imaginary self says that she's just discovered that she has a thing for bad girls with Chiaki in such an outfit.
• Ambiguous Situation: It's unclear if the potions she takes are just for her transition or if she also takes them for her wings.
• Bad Liar: She has no poker face whatsoever, as Micah notes. If no one specifically asks her about what she's hiding she's fine, but direct questions about things cause her to panic.
• Cute Bookworm: She absolutely loves reading and is quite adorable, especially when she shows her more laidback and vulnerable side.
• Establishing Character Moment: She's introduced to be so much of a bookworm that she doesn't even notice Chiaki entering the room or the fact that she introduced herself to the class until Eiji called her attention. As she was too preoccupied with a book.
• Fantastic Ableism: Arguably Averted, but maybe not. Nagisa is a Skyfolk who can't fly due to a Fictional Disability. When Chiaki first met and got to know her, she made some Innocently Insensitive comments about Nagisa being able to fly which upset Nagisa enough that she had to walk away. It's debatable whether that rises to the level of ableism but, either way, Nagisa quickly forgave and forgot, Chiaki learned her lesson, and the two have since become fast friends.
• Ironic Fear: Nagisa is a Winged Humanoid who's afraid of heights. Given she was nearly thrown to her death for being born with black wings, its quite justified.
• Wings Do Nothing: Justified, as her wings were broken when she was rescued after being thrown off her homeland as a newborn, apparently due to Kaminari holding onto her so tight, and are too small to be used in flying, but she still views them as a source of pride.

Micah

• Nice Person: Even when the situation is complicated, Micah always stays calm and polite.

Theodor "Theo" Elton Ainsworth

• Abusive Parents: It's suggested that his parents have discouraged him from getting his magic unsealed to control him.
• Arranged Marriage: He was briefly betrothed to Bonnie. He was more enthusiastic about it than her, though.
• Big Ol' Eyebrows: Theo has noticeably large eyebrows.
• Horrible Judge of Character: Bonnie claims this is Theo's biggest problem, that he's quick to judge and dismiss others but won't question people who could easily take advantage of him.
• Jerk with a Heart of Gold: Even though most of his early-story interactions with Keegan consist of him yelling at Keegan, Theo shows genuine concern for Keegan after the latter falls uncharacteristically silent when Chiaki reveals herself to be an Unbound.
• Love at First Sight: He gets a crush on just about any girl he meets.
• Have I Mentioned I Am Heterosexual Today?: He insists he's straight.
• Tiny Schoolboy: He is the shortest student in Room P-1, being 4'10".

Verity

• Deadpan Snarker: While a Nice Girl, she's not afraid to dish out a few darkly humored quips every once in a while. Such as how she expresses her frustrations after someone stole her and Eiji's pizza order.
  Verity: I hope that thief burns the roof of her mouth on our pizza!
• Genki Girl: She is very frequently excited and shows great enthusiasm in even the most mundane of things. Best exemplified when the gives a tour of the Grand Arcane Library and gleefully shows Chiaki the wonders of...the nearest restroom.
• Oblivious to Love: Micah has a crush on her, but she seemingly has no idea.

Eiji Akatsuki

• The Leader: Due to his brains and athleticism, the rest of Room P-1 seem him as such.

Belial/"Bee-chan"

• Blessed with Suck: She had Spirit magic, the rarest type of magic, before she was forcefully turned into a demon, and that plus demon Anti-Magic means that she has a lot of inconveniences in daily life.
• Contralto of Strength: Belial is described by Jocelyn to have quite a deep voice for a 16-year-old, she also has considerable strength and can be very intimidating.
• Dark and Troubled Past: Formerly a spirit-aligned human, she was corrupted into a demon at a very young age.
• Deadpan Snarker: When she's not being bold, she often pokes fun at people in a sardonic manner.
• Discard and Draw: When she became a demon she lost her magic.
• Has a Type: Belial likes tall guys and short girls. With a greater emphasis on the latter, if only because she's so tall herself that she has trouble finding guys taller than her.
• Height Insult: She's prone to jokingly mock people shorter than her, such as Theo. But given how tall she is, she'll even lightheartedly give Keegan, who's the second tallest member of Room P-1, the nickname "Shortstuff".
• Huge Schoolgirl: Belial is 6'4", making her the tallest member of the main cast, and she's only 16.
• If You Ever Do Anything to Hurt Her...: Belial will not hesitate to beat someone up if they threaten her friends.
• Unskilled, but Strong: While Belial, as a demon, is naturally stronger and durable than most people, she doesn't seem to be a very skilled fighter. When attacking Jude in retaliation for the Little Bastards robbing her and her friends, Jude is able to knock her out with some quick moves, and afterwards genuinely isn't sure if Belial was actually trying to kill them or if she just lacks the ability to restrain herself properly.

Keegan

• Bad Liar: He often finds it difficult to lie because his extremely expressive ears and tail usually end up giving the truth away.
• Blow You Away: Keegan is Wind-aligned and demonstrates his powers by blasting wind from his hands to shut a door.
• Devious Daggers: Is a jokester type, and he seems to use a knife in combat.
• Eyes Always Shut: Keegan’s eyes are drawn in a way where it seems as though he’s perpetually squinting. This is likely a way to emphasize his fox-like features. As this trope in Japanese is referred to as "kitsune no mo" ("fox eyes").
• My Greatest Failure: When Keegan was young, his older sister was injured to the point that she has, in his words, "never been the same since" while protecting him. He now regrets being unable to help her to the point that he is (at least until Belial tells him the specifics of the corruption process) willing to become a demon so he can protect the people he cares about.
• Plucky Comic Relief: While all the members of Room P-1 have their humorous tendencies, Keegan is far and away the most overtly comedic one.
• Sad Clown: Behind his jokester persona, Keegan has been shown to be dealing with his own issues. He witnessed his older sister get injured while defending him, giving him a drive to become stronger to the point that he's willing to become a demon until he hears exactly what the process entails, and something in his past caused him to become scared of Unbound people.
• Stepford Smiler: Though his usual demeanor is that of a rambunctious jokester, the few moments so far where he wasn't acting in such a way reveal that he is working through some trauma.
• The Tease: He loves to playfully flirt with his friends.

Nara Kendry

• Arbitrary Skepticism: Despite living in a world filled with magic, she considers "Unbounds" (travelers from another world), to be nothing more than a myth.
• Badass Bookworm: Despite being a librarian she's surprisingly fast and can react quickly, and is skilled enough with her ice magic to stop a fireball thrown at her by freezing it, just for starters. Bonnie and Rhys quickly give up on fighting or escaping her. She's even able to fend off Marchosias with indirect blows despite his demonic Anti-Magic.
• Deadpan Snarker: Nara has a very biting sense of sarcasm and sharp wit, which she often uses when faced with misinformation.
• An Ice Person: She has the ability to freeze objects and create ice and snow at will.
• Married to the Job: She is too busy with her 3 jobs at the GA Library to participate in the dating scene. She's so dedicated that she tries to get up and work even after being injured by Marchosias.

Redginald "Redge" Lewis

• Cool Old Guy: Redge is kind, respectable, and an all around pleasant old man.
• Happily Married: He's been in a loving relationship with his husband for over thirty years.
• I Was Quite the Looker: He's described to have had glorious flowing hair in the past.

Bonnie

• Abusive Parents: Implied; Bonnie ran away from home prior to the events of MIS, describes her father (and his associates) as scumbags (see below), and wishes she'd taken her little brothers with her when running away. Lynn has stated that "the experience [of growing up a princess] - whatever it was - was not a positive one for her, overall." Redge also notes that her father seemingly didn't even care about her enough to bother to search for her very long after she ran away.
• Aristocrats Are Evil: Not Bonnie herself, but this is how she describes her father and his advisors, nobles, and knights and how she views aristocrats in general.
• Arranged Marriage: She was briefly betrothed to Theo. He didn't exactly leave the best impression on her, though.
• Astonishingly Appropriate Appearance: She's a Fire-aligned redhead.
• The Big Girl: She's probably the strongest member of the Bastards, physically speaking.
• Fire/Ice Duo: She, a Fire-aligned girl, is in love with Rhys, an Ice-aligned guy.
• Outlaw Couple: Is in love with Rhys, who's also a member of her bandit team.
• Playing with Fire: She's Fire-aligned.
• Rebellious Princess: Feeling stifled by her father's expectations and the customs and traditions that came with being a princess, she ran away from home together with Rhys.
• The Leader: She's the leader of the bandits, helping to plan out and run their operations.
• Uptown Girl: Is in love with Rhys, who is confirmed to not be of noble background.

Rhys Nevins

• An Ice Person: He's Frost-aligned, meaning he can freeze or cool down objects and make ice and snow at will.
• Fire/Ice Duo: He, an Ice-aligned guy, is in love with Bonnie, a Fire-aligned girl.
• Outlaw Couple: Is in love with Bonnie, the leader of the bandit team.
• Trapped in Another World: He, like Chiaki, is an Unbound.
• Uptown Girl: Is in love with Bonnie, who used to be a princess.

Jude

• Painful Transformation: Their cursed necklace's transformations are incredibly painful, to the point that he fully expects it to kill him one day, maybe by age 19.
• Sex Shifter: He has a cursed necklace that turns him female in the morning and back to male at night.
• Your Days Are Numbered: They suspect that their Painful Transformation curse will kill them by age 19.

Harley

• Soul Power: He has Spirit magic, the rarest type of magic.

Arcadia/"Arc"

• Cute Mute: Doesn't seem able to speak, but is as cute as a button.
• Playing with Fire: The bell on her necklace hides a fire stamp that lets her shoot out fireworks as a distress call, which she uses to alert her friends to the demon about to attack them.
• Super-Toughness: As a Hybrid, she's a lot more durable than her size would otherwise indicate, to the point that a massive demon who would normally kill any witnesses to his presence looks for alternatives because finishing her off would be a hassle for him.

Marchosias

• Abusive Parents: He apparently was a father before becoming a demon, and not a good one.
• Establishing Character Moment: His first appearance has him swearing to kill Arc just for seeing him.
• Red Eyes, Take Warning: His red eyes show that he's killed many people.
• Revealing Cover-Up: Kills anyone who stumbles across him to hide his presence, but given that he's hiding in a slum, when the region has a sizable homeless population, the lack of any people around in the neighborhood sets off some alarm bells once someone takes notice.
• Would Hurt a Child: Has no issue killing kids, his only concern with killing Arc is that Hybrids are durable enough to make it more pragmatic to try and find another way to silence her first.

Fumiko Tanikawa

• Childhood Friend: She's been friends with Chiaki from a very young age.
• Love Martyr: No matter how much verbal abuse she gets from Kenta, she will always try to defend her boyfriend and deny that he's abusive at all.
• Oblivious to Love: Seems to completely miss the obvious signs that Chiaki's feelings are more than platonic. Even after Ai outright told her of Chiaki’s crush she acts like the other girl is merely misinterpreting things.

Kenta Maeda

• Alpha Bitch: A gender-inverted example. He’s one of the most popular students in Chiaki’s school, but is abusive towards his girlfriend.
• Everyone Has Standards:
  • He is an abusive boyfriend to Fumiko, but even he shows concern when Chiaki hits her head on the school gate; he desperately checks if she's okay and calls a doctor.
  • He also has no problem with Chiaki being a lesbian.
• Sir Swears-a-Lot: Kenta is shown to have quite the potty mouth.

Aika "Ai" Nakano

• Alpha Bitch: She is a pretty popular student at school and often loves tormenting Chiaki for her nerdy interests.
• Politically Correct Villain: Less villain and more a bully but despite tormenting Chiaki, she ultimately has no problem with her being a lesbian.
• Secret Secret-Keeper: She figured out that Chiaki had a crush on Fumiko after Valentine's Day.

Honoka Ishii

• Beta Bitch: She always follows Ai around and participates in bullying Chiaki.