Charlastor

Charlastor is the het ship between Charlie Mange and Alastor from the Hazbin Hotel fandom.

Canon
Both Charlie and Alastor is seem to enjoy dancing with each other in the pilot  "Thats entertainment"

Charlie seems to be very fascinated with everything Alastor is able to do.

Alastor quite enjoyed Charlie's performance during the 666 News live broadcast

Listening closely while Charlie is talking to Vaggie about Alastor, Alastor reports a part of Charlie's song "Inside of every demon is a rainbow" and his smile widens.

Charlie still trusts Alastor even tough she knows he's sketchy and probably doesn't really want to help her and her cause.

Fanon
It is one of the most popular ships in the fandom.