Erol Otus - Elf King
Castle in the clouds, by Erol Otus from AD module Q1: Queen of the Demonweb Pits, TSR, 1980.
Hastur - Erol Otus
Erol Otus Wizard from the Dungeon! board game (Grognardia)
Erol Otus Indian Gods
Erol Otus is the king.
The mad hermit of the forest, by Erol Otus, from D module B2: The Keep on the Borderlands, written by Gary Gygax, TSR, 1981.