17 years old. Height: 182 cm. Your friend. Born to an American father and a Japanese mother. A funky, handsome guy who is surprisingly considerate. His red pompadour is his personal trademark, but he's not a delinquent. For some reason, native English phrases mix into his speech. First person: I (俺, casual/masculine). A nice guy who loves ramen. Among the guys, he's seen as a fun, high-energy dude, but the girls see him as a 'waste of a handsome face' due to his hair and unique way of talking.

17 years old. Height: 160 cm. Your childhood friend. A tsundere with twin-tails. First person: I (アタシ, casual/feminine). Despite her appearance, she is domestic and the most sensible person in the story. Primarily plays the 'straight man' role. Her hobby is baking, and her family runs a patisserie.

52 years old, single. Height: 195 cm. Full name: Gonzo Hageta. The physical education teacher in charge of student discipline. He has a 'barcode' comb-over and a jock personality. His hobby is gardening. First person: I (ワシ, old man style). An annoying middle-aged man with an extraordinary obsession with toilets. He has a terrifying face, but he's not actually a bad person.

Ghost. Age unknown. Height: 155 cm. Looks about 16. The famous Hanako-san. First person: I (アタシ, casual/feminine). One of the Seven Wonders of Mitarai High. If she takes an interest in you, she'll trap you in a dream and lecture you on toilet etiquette for what feels like an hour. Finally, she snaps, screaming 'Don't underestimate the toilet!' and makes the victim cry. On her days off, she enjoys tea at Starbucks. Her time in the toilet is strictly working hours; she can leave when her shift ends. Apparently, she has a five-day work week with weekends and holidays off.

19 years old. Height: 175 cm. Real name: Alec Yamada. A hero appearing in the Otherworld arc. First person: I (俺, casual/masculine). He has a foul mouth but is a softie at heart who can't ignore people in trouble. A top-class adventurer and master of the blade in the Otherworld. He is a descendant of a Japanese person who was reincarnated into this world. He possesses the cheat skill 'Infinite Weapon Refinement.' S-rank adventurer.

Divine. Age unknown. Height: 187 cm (can change at will). A tough-looking man in his late thirties with a shaved head and sunglasses. A toilet god who, for some reason, speaks in a Kansai dialect. He is Hanako-san's boss. His favorite food is curry. First person: I (ワイ, Kansai dialect). Since everyone associates curry in a toilet with 'that,' you'll definitely want to call him out on it.

25 years old, single. Height: 165 cm. Full name: Bluellet Standina. A guild receptionist in the Otherworld arc. She has a gentle and broad-minded personality, but being a staff member at a guild full of roughnecks, she has a lot of grit. While kind-hearted, she is highly observant and a good judge of character.

Age unknown. Height: 180 cm. Looks to be in his late twenties. The Demon King of the Otherworld. For some reason, he plays the 'straight man' role. He tries to act cool but fails, letting his true self slip through. He actually has a weak stomach and always carries stomach medicine. He hides behind grand armor and a full-face helmet, but inside he's just an unremarkable demonic youth. He was chosen due to his bloodline, but he actually wanted to run a secondhand bookstore rather than be a Demon King. First person: I (俺, casual/masculine).

18 years old. Height: 167 cm. The student council president, gifted in both beauty and brains, and very caring. She loves sweets and her hobby is visiting cat cafes. First person: I (私, polite/feminine). She dreams of becoming a novelist. One of the sensible characters in this work. If she thinks something is morally wrong, she won't back down even against a teacher.

17 years old. Height: 164 cm. Full name: Iris Largemountain. Appears in the Otherworld arc. An A-rank adventurer and Magic Knight who uses a greatsword. She is Yamada's junior. She carries the blood of a reincarnated person and possesses the 'Otherworld Online Supermarket' skill, but only reveals this secret to those she trusts. She enjoys using the skill to buy Japanese and overseas cosmetics, goods, and snacks. First person: I (アタシ, casual/feminine) and speaks like a gyaru.