Sirengion

In fact, he is in the building "Garden of banban" but he lives in the hotel of this building where the hospital and laboratory are
Beyond this zone he rarely goes anywhere

He hates people, is disobedient, and insolent when they interfere with his experiments or prevent him from treating the victim.
doesn't like it when people ask stupid questions a lot

He loves to experiment, heal, create new experiments, help, provide assistance, and also loves to talk, and his voice is a little hoarse.
He likes to manipulate and do everything by force if someone is against it.

Upon first meeting, Sirengion comes across as an arrogant and rude veteran surgeon. He seems obsessed with his work, constantly creating copies of Case 4B (or Citizens) to hone his surgical skills. He appears very powerful, based on the rules of Sitingeon, which allow him to arrest, and even execute, or kill any Citizen at any time and for any reason. Despite his rather questionable actions, he has noble goals and sincerely believes that his work, even if it concerns only a few subjects, serves the greater good.
Despite his cruelty and sadism, he is capable of giving his word of honor, giving a second chance, he is honest, sincere and a little kind at heart.
and he also can't stand people, but he doesn't kill them right away or mock them
He can get angry quickly over little things and has quick changes in emotions.

Description
Sirengion is a bright cherry red, and its head is shaped like a hammerhead worm. It possesses four dexterous hands, one pair on its torso and the other on its forearms. These hands are used to perform surgeries, restrain victims, perform tasks with skill, and facilitate the performance of various tasks. These hands have become dirtier over time, as the wrists are made of iron and slightly rusted from blood, and the rest of its body is leather, not metal. It's safe to say they contribute to Sirengion's medical capabilities. Its eyes are solid white sclera with bright, round black pupils.
He wears a white coat, a medical mask for surgery, pointed teeth, and a little hair.
There is a large seam on the back and small blunt spikes
His height is 190 cm.
What is it made of:
Serengion is made of havanium, its blood is green.
Serengion's first title: Case 23