Here we have Zeltari!
This is the demon that Demitri manages to befriend. Demitri's description can be found here: https://www.weasyl.com/character/14445
Zeltari is a full-fledged demon, and has many abilities. His most commonly known abilities are:
There are several other secrets and abilities Zeltari has, but those and more will be revealed in the story I'm writing about Demitri.
Unlike most other demons, Zeltari has no interest in killing and eating the flesh of mortals. He prefers to spend his nights partying with random people and drinking lots of alcohol (not that is affects him).
Link
foxboyprower
I bet regeneration of lost body parts helps being a friend of Demitri.