PuppyCat is secretive and aloof. He considers himself a figure of high status, once referring to a ladybug as his "peon" and callingDeckard a peasant, ordering him to carry groceries. Furthermore, he considers himself to be "cool", which he expresses when wanting a leather jacket.
He can be cold and mean, as seen in "Food", where he repeatedly ruins Bee's and Deckard's cooking. However, he does this by pushing objects from cupboards, etc., a behavior cats are known to exhibit. It is possible that due to his (current?) form, he shows cat-like behavior.
He does not appear to be a bad person, since he let Bee tag along on his Temp jobs in the first place and at least cares enough about her not to let her die during their jobs.