Koopie Koo is a character who appeared in Paper Mario: The Thousand-Year Door for the GameCube. In the game, she lived in Petalburg along with a lot of other Koopa Troopas (note that this one isn't an enemy). Her boyfriend is Koops, who has gone off to help Mario find the Crystal Stars that open the Thousand Year Door.
She sometimes has a nasty attitude, and even though she wants Koops to be brave, she doesn't want him to fight Hooktail, the dragon who has been eating many of the town's Koopas.
- That's Koopie Koo, a local Petalburger. She seems to be Koops's girlfriend. Gosh, she's really cute...and she seems to have a good head on her, too.
- Koopie Koo can be seen in the Paper Game of the Pianta Parlor.
- Koopie Koo is one of the few Koopa Troopas to have a full head of hair.