There's various stat emphasis that exist for the different subraces. Also, racial skills will go in at a later date but for now, the only thing differentiating races in terms of game mechanics is their stats and of course, descriptions in-game.
Stats: Strength, Agility, Constitution, Endurance, Magic.
Lycan: Mostly averaged out stats.
Bear: Higher strength.
Feline: Higher agility.
Centaur: High constitution, lowest agility in the game. I imagine it'd be hard for them to turn around or navigate in tight spaces made for more normally-shaped races.
Rabbit: Higher endurance.
Satyr/Nymph: Higher magic.
I would like to have frog Otherkin but giving them all unique stats has been somewhat difficult. I am thinking about frogs being mostly averaged but with slightly higher magic.