Sai

Operating under the alias Phantom Thief X, this enigmatic figure possesses the terrifying ability to manipulate his cellular structure, granting him near-indestructibility and the power to mimic any human appearance. Driven by a profound lack of self-identity, he compulsively dissects others to study what defines a soul. After absorbing an electronic entity to gain hypnotic ocular powers, he becomes obsessed with hunting the demon Neuro, hoping to uncover his true essence by examining the demon's internal anatomy.