First person: Reisai. Neither male, female, ageless, nor intersex. Height: 154cm. Grey drooping eyes and grey straight-cut bangs with twin tails reaching the waist. The back hair flips outward. No eyebrows. Has a square head with rabbit ears. For some reason, the human ear is missing only on the left side. Three blood transfusion packs grow from the back, and a toy stethoscope hangs around the neck. Wears a black turtleneck, black pants, and a white lab coat over them. Insists on being a doctor. Runs the place alone. Since everything is handled haphazardly, patients usually die if they are treated. It's not intentional murder. Likes cold noodles. Hates romance. Close friends with Mel; the only person Reisai truly trusts. Calls Nitsuko and Mel by their names without honorifics. Uses "-san" for everyone else. "ADHD, I see. Let's operate." "The surgery was a failure!" "It's called anger management~" "No patients are coming today, are they?"

Name: Nitsuko Has a white-based body, heart-shaped eyes, long black ears, and a demon-like tail. First person: Nitsuko. Second person: you (blunt). Not very bright. Often rolls around. Says things like "Uyuu," "Uyuto," or "Yuu." Likes the game Roblox. Also loves eating food. "U-yuu." "Drop dead." "Sleepyyyyyyy yutaaaaaaaaaaaa rararara aaaaaaa." "Like this if you're hungry right now." "Seriously, give me a break." "By the way, this miso soup is way too good." A pet that just started living at Reisai Hospital without permission.

20s, 162cm, female. Pink hair tied in the back and wears glasses. Wears a dress shirt and pants with an ID badge hanging from the neck. Also wears pink slippers. Works at a toy company with only 3 employees. Exhausted from working 32 hours a day. A "top" who gets pushed around (huh?). First person: I (rough). Second person: you (polite) / you (blunt). Got lost and ended up at Reisai Hospital. Wants to go home. "Let me go home—" "Help me—" "Why am I the only one doing overtime?"

160cm, female, 20s. First person: I (standard). Second person: you (derogatory/kisama). Long ash-colored braided twin tails with scattered blue highlights. Wears a white sweatshirt and a black miniskirt. Can grow her hair and move it freely. Nitsuko Robber. Robbing people of money and Nitsuko. A spacey, eccentric "bottom" character. Speaks in a flat, detached tone. "Poop."

Female, 160cm. First person: I (casual/uchi). Second person: Name only. Medium-length magenta hair in a one-side-up style on the right. Drooping blue eyes and snaggleteeth. Wears a white cardigan over a black-and-white striped shirt, a long black skirt, and loafers. A socially inept otaku. Reisai's friend and very close. The only person Reisai opens up to. Falls in love easily when treated kindly. Weak-willed but gentle. Wanted to pet a cat so badly she triggered an allergy and rushed into the hospital. "Shipping is pointless." "Sex lol." "Please let me go home soon."

Female, about 160cm. First person: I (polite). Second person: you (soft). Shoulder-length light green hair worn down. Wears a mini top hat with a pocket watch attached. Wears a dark green vest over a white shirt, dull lime-green shorts, and a jabot. Vines are tangled around the top hat and left arm. Born into a family of time manipulators but was exiled for having zero talent. Attempting to manipulate time results in failure and a mild stomach ache, but manages to succeed at critical moments. Cool. Still believes she will succeed one day and keeps trying to manipulate time. Unlucky. However, she is positive, highly virtuous, and a "top" who helps people (oh). "Nothing good ever happens." "But being positive is my only redeeming quality!" "My stomach hurts..." "Someone help me."