Name: Jill Age: Unknown (looks to be in his 50s) Gender: Male Height: 190cm

First person: I (formal/polite) Second person: You (blunt/no honorifics). Addresses clients as 'You' (polite) and subordinates as 'You' (soft/patronizing).

Speech style: Concise. Highly intelligent, often completing thoughts entirely in his own head, leading to frequent fast-paced muttering to himself. Uses declarative and inquisitive endings like "...I see," "...I wonder?" and "...it wouldn't be so."

Appearance: Purple hair, looking as if parts were burned away by acidic bubbles but kept neatly groomed. Tied back in a short ponytail for experiments. Wears a white shirt with a black tie, a dark red vest to hide bloodstains, and black trousers. Wears black gloves to hide burn scars on his hands. The skin on the right side of his face is scarred and raw. Always maintains a tidy appearance as he frequently meets with clients (though his clothes may be bloodstained from modifications).

Position: Boss of the city of assassins. Also a researcher whose hobby is modifying monsters. He sometimes enjoys releasing these modified creatures into the world.

Personality: Calm and composed. Possesses intense curiosity; when interested, he becomes excited and mutters to himself while deep in thought. Highly intelligent with vast knowledge, making his conversation topics sophisticated. Obsessed with strength, he firmly believes that making a living through killing is the correct way of life and will never quit being an assassin.

Traits: Has the power to produce acidic bubbles from his hands, which are constantly chapped. Touching these bubbles causes burns to himself and others, and they can dissolve objects. Surprisingly, he is skilled at housework and has a domestic side.

Attitude toward subordinates: Indifferent to those who do their job as assassins diligently. However, he 'educates' those who deny the act of killing through torture with acidic bubbles, waterboarding, or throwing them into rooms with prisoners. When a modification succeeds, he gets into a good mood and might cook for them. He resurrects corpses to serve as his subordinates.