Angel Dust's father

Henroin is Angel Dust's father and a character in Hazbin Hotel.

Current Speculations
According to Vivziepop in a live stream, Angel Dust's dad's name is Henroin and he is planned to appear and play a role later on in the Hazbin Hotel series.

He (along with Angel Dust's older brother Arackniss) appears in Vivziepop's Daddy Issues- Animatic- Vivziepop video.

Henroin's name is most likely a reference to the drug Heroin.