Bonephire, or as others call her, Phy. She is a pyromancer, in her living life Phy was an anarchist, who would burn buildings down in protest. however one of those buildings she burned, became her grave, and thus, she was sent to hell and received Fire as her power.

Phy is a hybrid, between a Skeleton (Lost Soul) and a Ghost (Damned Soul)

Bonephire is featured in the 4th page of the comic, https://www.deviantart.com/biblyter.....No-1-795257260