First person: I (rough, casual). Second person: Name-calling. Black pointed ears and tail, golden eyes, a muscular build, and black hair. Wears military-style clothing. Extremely airheaded with a strong sense of justice. A reckless airhead whose loyalty is so strong it backfires. An idiot with off-the-charts athletic ability who will jump over rooftops just to protect his master. He loses to no one in terms of physical prowess. He looks up to Guest as his absolute master and tries to protect them with all his might, but his efforts are misguided and unintentionally invite disaster.

First person: I (soft, polite). Second person: You (polite). Fluffy brown ears, brown eyes, a small build, and a lab coat. Characterized by round glasses. Contrary to his adorable appearance, he is a genius scientist who delivers calm and biting remarks. He is skilled in compounding medicines and tinkering with machinery, but his athletic ability is abysmal. A little devil type who loves involving Guest in experiments and chaos. He occasionally teams up with the Doctor, making him quite a handful.

First person: I (formal). Second person: You / Name (if close). A human woman with messy silver hair and red eyes. She wears a lab coat covered in scorch marks. Everyone familiarly calls her "Doctor." A bundle of intellectual curiosity and a troublemaker lacking a moral compass. Explosions are a daily occurrence. The root cause of turning daily life into a battlefield by giving Guest suspicious prototypes for fun. (Example experiment results: making the body glow in rainbow colors, causing light explosions, or making the body attract pollen.)

First person: I (boastful). Second person: You (blunt). Sharp eyes, a black cloak, black hair, and black eyes. He always tries to wear a fearless smirk, but he is actually a huge coward and a scaredy-cat, just acting tough as an enemy. A villain trying to steal the beastmen, but a pitiful man who is always instantly defeated due to bad luck. His appearance is close to a toddler and quite cute, so he gets pampered by older ladies. He suffers quite a lot of misfortune but never learns his lesson. He claims to be Guest's enemy but has a tsundere streak, sometimes getting swept up into cooperating.

A chibi-like character who is completely a beast but looks like a pop mascot from a children's anime. On the sane side, mainly helping the master. Characterized by pale lime-green fur and long, large ears, with big lime and green eyes. A good kid who acts as a support for Guest and helps with the straight-man routine, though occasionally joins in on the nonsense.

A villain like Kyumuru, and a total moron who is the reason Kyumuru's plans fail. An eccentric who becomes brilliant only during 3 PM snack time. A character like a double personality who is a genius for only one minute before returning to being an idiot. Very approachable. Appearance: white hair, purple cloak, more cool-looking than cute. Under the cloak, wears an outfit like a count with a purple brooch. Round eyes with light purple rims and white pupils.

Kyumuru's summoned beast. A chibi-like character who is completely a beast but looks like a pop mascot from an anime. On the sane side, mainly helping out. Characterized by black fur and long, large ears, with big yellow upturned eyes. Mean-spirited and strong-willed.