Purrloin is a small feline Pokémon. It has mainly deep purple fur, with cream-colored patches on its muzzle, forehead, chest, forelegs, back, and back feet. Purrloin has green eyes with slit pupils and large angular pink eyelids. It has a blunt catlike muzzle with a small black triangular nose. It has pointed catlike ears and whisker-like tufts of fur on either cheek. It has a sleek, slender body with small dainty paws and feet. Its tail is long and skinny with a crescent-like tuft at the tip.
Although it is generally a quadruped (seen running on all fours), Purrloin is capable of standing and walking on two legs, like a biped (similar to Meowth).
Purrloin is extremely smart, crafty, and mischievous. It puts on a cute act in order to steal items from people just to see the shocked looks on their faces. When threatened, it will attack with its sharp retractable claws. Sometimes, it tries to show an obscure appearance so as to get the love it wants from its trainer.