All Paizo races with an RP value of 15 or less are allowed as well as the following.

PLAYABLE RACES
Bakemono
Beastial
Doppelganger
Draconian
Dryad
Gargoyle
Goblin
Homunculus
Kappa
Overseer
Revenant
Steed


CREATING MONSTERS & RACES
Creature Creation
Monster Feats
Traits


RP VALUES
Every race costs a certain amount of race points based on their size, lifeform, shape, type, and subtypes.