|Location||Pitch Black World|
|Affiliation||Pitch Black World|
Yagi has raceless white skin, red eyes with bags underneath, messy white hair with ears that have gray tips and a pair of mountain goat's horns. He sports a long black coat that reaches up to his knees, has a fur collar, and three brown buttons of different shades lined up in a straight column. Underneath, he wears a red collared shirt with brown buttons, grayish pinstriped pants, black dress shoes and a black tie. He is often seen wearing a gas mask with a bio-hazard symbol on it.
Yagi has been said to love alcohol and cigars, he however does show concern for his boss when he drinks 'recklessly'. Described to be a 'loser man' running from his wife.
Not much is known about his past.
Up to this day, Yagi has only appeared in some of Deep-Sea Prisoner's Illustrations.
Jork is Yagi's son, he has the tendency to tease his son about how weak he is but doesn't appear to have a bad relationship with him either.
His "favorite subordinate" according to Deep-Sea Prisoner. He can't reject Yagi's orders. In one mini-comic, he forced Sullivan to drink with him.
Satanick is Yagi's boss, Satanick once went to Yagi to vent about his feelings regarding Ivlis where Yagi gives advice to use drugs or brainwashing. Yagi has apparently seen this situation before with Satanick.
- Yagi means 'goat' in Japanese. The way his name is written, however, literally translates to 'night tree.'
- Yagi has referred to someone as a 'smoky bastard' this either alludes to Fumus or Gokuen.