TV-Series
Description
Takeuchi is a vampire and D-class operative in the military unit Code Zero. He gained immortality through a unique lab accident where a vial of vampire blood exploded, splashing directly into his eye, bypassing the typical bite transmission method. He possesses an immortal brain and serves primarily as a scientist and engineer.

Physically slim and of average height, Takeuchi sports pink hair in an undercut style. He wears a monocle over his left eye, two red earrings per ear, and two black piercings under his right eye. His attire consists of a reddish-orange collared shirt featuring a gold medallion, suspenders with an extra hook, rolled-up slacks, a leather belt with a pouch, cut-style brown gloves, yellow socks, and black-and-white dress shoes.

Takeuchi exhibits an eccentric, scientifically driven personality. He expresses gleeful enthusiasm for experimentation, viewing his immortality as an opportunity for endless research. This manifests when he labels a bitten soldier a "valuable sample" and matter-of-factly tests vampire resilience by shooting a teammate, prioritizing scientific curiosity over emotional concerns.

Within Code Zero, Takeuchi provides technical support through inventions and strategic planning rather than frontline combat. He develops tools like stink bombs and researches the artificial blood substitute Ascra. Following a major earthquake, he salvages his early Ascra research from submerged floodwaters. His analysis reveals Ascra-enhanced vampires combust instantly in sunlight. Building on this, he theorizes Ascra could be reverse-engineered to create a diluted serum allowing vampires to age normally if desired. This potential cure addresses child vampires created through tainted vaccines and could benefit long-term vampires resentful of eternal youth.

Takeuchi maintains a pragmatic outlook, showing no regret about his vampiric state due to the intellectual advantages of an ageless brain. His background as a human researcher is suggested by his resourcefulness, including safeguarding critical research for future retrieval.