Catgirls are female humanoids with cat ears and tales.
Source (Comics by Nyan, TTMTTP)
They feature prominently in Pandora's Tale.
Real catgirls are usually Helpers,[SemiCanon]
but some fictional catgirls are not.[tfp1]
The tabletop RPG Land of Legends: Lost has a species called the werecat. Werecats are not normally a player race.[c10p9]