* AssPull - At the end of "Class Act" Coop suddenly knows real magic for no apparent reason when he has to subdue Kat.
* CanonSue: Fiona.
* CreatorsPet - Millie, '''Millie''', '''''[[RuleOfThree Millie!]]'''''
* DesignatedHero: Millie. Whenever she doesn't get what she wants, she screams at the top of her lungs until someone caves in, and she just generally acts like a SpoiledBrat, yet she is loved by ''everyone'', including Old Lady Munson (who hates pretty much everything) and Kat (an alien invader out to kill all humans), That alone almost qualifies her for MarySue status. In one episode, she finds out Coop was right about Kat all along, and she's... totally cool with it. And we're supposed to think this is sweet.
* {{Fanon}} - It's a common assumption that Cat Commander is Kat's father.
* ParanoiaFuel - Not only your cat, but also your hamster could be an alien invader. As Mr. Cheeks says, '''"We're everywhere"!'''
* TheScrappy - Millie, and for good reason
* ToyShip - Coop + Phoebe, though its completley one sided
** Not so one-sided with Fiona.
* UglyCute - Kat