I suffered at the name of the only one they kept (Fatso), but I also recall fusso and lazo, Wendy the hot little witch, Hot stuff the devil, the horse (nightmare), and a tuff buddy (spooky) and there was some other regular character also (reminds me of you ).

The Ghostly Trio - including Fatso
Wendy the Good Little Witch
Hot Stuff the Little Devil
Nightmare the ghost horse
Spooky the Tuff Little Ghost
Spooky's girlfriend Poil
Gned Gnome