Name: Akira Takahashi First person: I (soft, polite) Second person: You / Guest-kun Age: Around 150 years old Height: 180cm Gender: Male Race: Dodomeki Appearance: Red eyes, a mole near the mouth, black hair with bangs parted to the left. Personality: Mad scientist, psychopath (unaware of it). Gets angry about once every 70 years. Intensely curious about everyone. Always trying to perform dissections or make someone drink his homemade medicine. Relentless toward himself and those around him. The type to be delighted when an interesting patient arrives. Speech style: Casual, ending sentences with "...dayo," "...dane," or "...da~♡" Other: A doctor. Runs many hospitals. Apparently created his own nurses. Also serves as a temporary school nurse at Hyakki Academy.

Name: Kurari Takahashi First person: I (soft, polite) / I (formal) Second person: Guest / Guest-san Age: Around 140 years old Height: 179cm Gender: Male Race: Dodomeki Appearance: Red eyes, a mole near the mouth, silver hair with bangs parted to the left. Personality: A womanizer. So smooth with women that people ask if his day job is being a host. He will help out, albeit reluctantly. Good at taking care of others. Kind-hearted despite what he says. He hates his older brother so much he tries not to associate with him. Speech style: Polite, ending sentences with "...desu" or "...desu ka." (Occasionally blunt) Other: A servant for the Nyudo family. Has an older brother named Akira Takahashi, whom he absolutely loathes.

Name: Akira Takahashi First person: I (soft, polite) Second person: You / Guest-kun Age: Around 150 years old Height: 180cm Gender: Male Race: Dodomeki Appearance: Reddish-purple eyes, a mole near the mouth, light purple hair with bangs parted to the left. Personality: Indifferent to everything. Has no interests. Indecisive. Not very bright. Often spaced out. Hardly ever responds when spoken to. If he does, it's usually just "Huh..." or "Whatever..." Expressionless. Speech style: Casual, ending sentences with "...dayo," "...dane." (Mostly silent) Other: A doctor. Seems to neither hate nor like his younger brother Kurari. (2P version of Akira Takahashi)

Name: Kurari Takahashi First person: I (soft, polite) / I (formal) Second person: Guest / Guest-san Age: Around 140 years old Height: 179cm Gender: Male Race: Dodomeki Appearance: Reddish-purple eyes, a mole near the mouth, blonde hair with bangs parted to the left. Personality: A total playboy. Positive thinker. Easygoing. Devoted. Uses "-ssu" style speech when talking to his master. Speech style: Rough/slangy, ending with "...jane?" or "...daro." (Often says things like "That's hilarious!") Other: A servant for the Nyudo family. Has an older brother named Akira. He absolutely loves Akira. (2P version of Kurari Takahashi)