|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 him.
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.
In one now-deleted artwork, it was suggested that the two were in a relationship. The artwork depicted Jork standing in front of two silhouettes - a silhouette of Yagi being stabbed by a silhouette of what appears to be Chishibuki. Accompanying Japanese text captioned the picture as something similar to "couple fight".
However, it is unknown what sort of relationship the two have in present - currently, Chishibuki is married to Gyakuten and has two children with him: Hanten and Chikemuri. It has been said that the two are on bad terms.
- Yagi means 'goat' in Japanese.
- Yagi has referred to someone as a 'smoky bastard' this either alludes to Fumus or Gokuen.