Player races that I've had in my campaign world (Greyhawk):
- All the standard races
- Lizardfolk
- Centaur
Other races I'd have no problem with:
- Selkie (party NPC at one point)
- Goblin (party NPC at one point)
- Hobgoblin (party NPC at one point)
- Werecreatures
- Aasimaar
- Tiefling
Basically any good character idea for a "normal" monster race, I'm open to if the EL fits, but there's some things that strike me as just silly, such as half-dragons and half-ogres. They don't fit my fantasy biology, so they are out, both as monsters and PC's.
As for abnormal races that I allow as monsters but not as PC's, that would be brainless stuff and things that could not interact with a normal D&D party. For example, Gibblering Mouther NPC's are right out.
