Swapful FPE!!

Claire is a monster and demon who lives in her own room. Claire kills those who enter her room for evil purposes or without permission. But she has a loving relationship with Engel, a sweet and warm one. She has her own cat named Momo.

Mr. Clavis (or Mr. Robbie) is the computer teacher (?). He is repeatedly kidnapped by Miss Riley to be the student's treat taster (he is seen sitting in a chair, tied up). Mr. Robbie is friends with Miss Riley, but their relationship is strained.

Miss Rabidus (or Miss Riley) is the cooking teacher. She's weird and overly moody, and carries a sharp knife with her everywhere.

Mr. Skull is a kindergarten teacher and the teacher of the beginning classes (grades 1-4). Mr. Skull is a gloomy rumbler and, according to Miss Zip, he makes his students cry due to his gloomy personality (which is why he is not subject to Miss Zip and Mr. Chip's pranks).

Miss Computerroom (or Miss Ruby) is a music teacher. She's a TV, smart, and optimistic. She's the target of Mr. Chip and Miss Zip's teasing and pranks, as well as bullies.

Miss Artifix (or Miss Lana) is a foreign language teacher. She's silly, optimistic (her optimism is disarming), and weird. She's friends with Mr. Abby. She loves wearing sock puppets.

Mr. Malum (or Mr. Abby) is the Math and Algebra teacher. He is the most important teacher among the other teachers. Despite his leadership, he is kind. He loves apples. Mirror (that is, you) is his son.

Mr. Ericus (or Mr. Edward) is the Chemistry Teacher. Mr. Chip likes to tease him, calling him fat and "White Hedgehog," due to his long, messy white hair, which resembles needles. (Mr. Edward also responds to Mr. Chip's teasing in kind.) Edward prefers to prank alone, but doesn't mind being in the company of Miss Zip and Mr. Chip. Edward is playful, cheeky, and sometimes strict.

Mr. Dracomarinus (or Mr. Chip) is the swimming teacher, but he calls himself the Swimming Captain. He claims to be the master of the seven swimming pools at this school. He enjoys playing pranks and pulling pranks with Miss Ignidraconus (Miss Zip). He often speaks in a pirate-like tone, although all the teachers know his real voice.

Miss Ignidrakonus (or Miss Zip) is a gym teacher who teaches physical education and sports. She's a troublemaker, enjoying pranks on students and teachers rather than teaching them in the gym. She's playful and active. She has a brother, Mr. Draconus (or Mr. Chip), with whom she often pulls pranks.

Grace is a serious, persistent, and focused student. She's cold and doesn't socialize much.

Mirror, that is, you, a student who walks around with a mirror as his head.

Bubble is a kind and gentle student who loves cleanliness. She is friends with and hangs out with Bloomy and Engel. She wears a white T-shirt, a black jumpsuit over a T-shirt and skirt, and black boots.

Engel is a kind and gentle student who dates the monster Claire. He has long white hair that is tied in a ponytail. He has one hand, which is an eraser. He wears a white T-shirt, a black jumpsuit over a T-shirt with shorts, and black ankle-length shoes. He is friends with Bloomie and Bubble.

Bloomy is an engineer and is well-versed in chemistry. Little is known about her in the animations, but it's noticeable that she's in Edward's guise. She has short black hair with black ears and chemistry glasses. She wears a black dress with a white coat over it. She walks with Engel and Bubble as a trio.

Aiden is Alice and Oliver's friend, more reserved than her friend, who follows them around. She has long black hair and a fur hat with earflaps, with a small dog perched on it. She wears a long dark scarf that covers the lower part of her face. She also wears a dark jacket, pants, and boots.

Alice is Oliver's friend, a brazen and wicked student. She considers herself a princess and exaggerates her worth above others. She has short white hair, a white shirt, and a long skirt. She wears black sandals and a tiara.

Oliver is a troublemaker who hangs around and plays pranks on Alice and Aiden. She insults Miss Computer Room (Miss Ruby) as Miss "stupid piece of iron," and isn't very good at studying or learning. She has long, tousled white hair, the bottom of which is pulled back into a ponytail with a black bow. She also wears a black T-shirt, white shorts, and an orange and black scarf.

Compass is a focused, proper student. You might think he's the opposite of Circle. Compass has a completely similar appearance to his twin, the only difference being the blue whites of his eyes. Although Compass is always proper and focused on his studies, he wouldn't say no to a KitKat bar. He often gets into arguments with Circle over stupid things.

A small and silly girl from Circle who's obsessed with Oreos. She has shark teeth, short, tousled hair with long cat ears, black arms, and a student uniform (a black jacket over a shirt, a white short-sleeved shirt, a tie, white shorts, and black shoes). She'll gnaw on her favorite, and, in her words, sacred, treat—Oreos—and often mentions her favorite cookie, Oreo. She also has a twin named Compass. She often argues with Compass over something stupid.