Indigo

Indigo is a doctor who serves under Shiki.

Appearance
Indigo is an indigo haired doctor with a mime-like appearance. He wears a large yellow polka dotted indigo scarf and indigo striped shoes. He also wears indigo overalls and a lab coat over them

Relationships
Indigo shares a rather humorous relationship with Shiki. Whenever Shiki says or does something stupid, Indigo acts as a straight man and slaps him. After which they both present themselves to others like a typical comedy duo after a joke.

Abilities and Powers
Indigo appears to be a chemist of sorts. He seems to be in charge in the development of Shiki's scheme. He is the one that created Boss and the other monstrous animals under Shiki's dominion.

He is probably a formidable fighter as, during the the Battle of Edd War, he fought with Shiki against Roger's crew armed with pair of Florence flask with chemicals inside.