Diablo, Dungeon Siege & Sacred didn't have restrictions. The sequels do (1 per character).
Blizzard, Gas Powered Games & Ascaron have pc backgrounds.

Hellgate has 1 slot each (some ex blizzard staff), not sure about Titan Quests (1 slot each) creators.

Last edited by swalnak; 22/10/08 01:44 PM. Reason: clarification