Do We Have This One?
? Needs a Better Title
Basically, a character who is Satan
in everything but name. He runs a place where the dead go, or is the ultimate evil in whatever work he's in, or just loves torturing people, but he's not Satan. This trope has two forms:
Type I: The work is meant for kids, so they can't come right out and say it. The implications are obvious.
Type II: The work takes place in an alternate world where a made up character has Satan's shtick.