Fushi

不死 (フシ

Fushi is an immortal being capable of assuming the form of anything that has provided him with stimuli.
His original shape was a featureless white sphere. Lacking consciousness, he copied the first object he collided with, which happened to be a rock. Shortly thereafter, he transformed into moss and remained in that state for a period. When a wounded wolf wandered nearby in the middle of winter and died, the immortal copied the wolf. He retains the ability to transform into these entities.
Later, following the death of The Nameless Boy, he mimicked the boy's appearance, taking the form of a young boy with white hair, a pale complexion, and green eyes. He wears a short, brown fur cloak, a light blue shirt and pants, and fur boots. A rope dangled from his hand and neck because The Nameless Boy was holding Joaan's leash when he died, although the leash soon disappeared. The injury that caused The Boy's death is also present on Fushi's left leg. Fushi commented that this form felt like it belonged to him the most.

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Details:

First name:: Fushi
Age:: ~800 years (according to books about him)
Gender:: male (in his main form); can be female
Species:: Immortal
Affiliation:: The Guardian Force (formerly); Tonari's Group (formerly); Booze Man's Shop (formerly); Aoki Family (currently)