Vyvyan Basterd
Adventurer
(hint: items that turn you evil and into NPCs don't count as wieldable)
See, here's where people are actually having a problem with what you are saying. Some PCs start evil, others turn evil through play, and yet others, as you suggest, against their will. Not every DM requires that a PC turned evil becomes an NPC. (I actually do disallow evil PCs and anyone turned evil in my campaigns becomes an NPC, but I understand that this is my choice and not a fact of the rulesets.)