Enkai (煙海) is a character that has yet to formally appear in anything. He is a human wearing a gas mask, though nothing is clearly known.
Enkai has messy blonde hair with an ahoge and fair skin. He wears a typical gakuran which consists of a black coat with mandarin collar, five golden buttons which he leaves unbuttoned, white dress shirt, black trousers, and black dress shoes. He wears a gas mask.
Enkai is a lewd sophomore that tells dirty jokes. 
Not much is known yet.
Up to this day, Enkai has only appeared in some of Deep-Sea Prisoner's illustrations.
He has yet to be shown interacting with someone.
- "Enkai" means "sea of smoke".