|Tattle||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. Thing is, because she's smart, she kinda mothers Koops a little bit...I guess it's a complicated relationship. But then again, what relationship isn't?|
Koopie Koo is Koops' overprotective girlfriend. She appears in Paper Mario: The Thousand-Year Door. Koopie Koo pleads with Koops not to join Mario's team and go slay Hooktail to avenge his father, but Koops is adament about his plans. She loves Koops not matter what; he needn't prove anything to her in the game. Although Koopie Koo loves Koops unconditionally, Koops still wants to change himself and become a hero. She consents to his leaving for the journey. After Koops left Petalburg with Mario, she waits for Koops to return home as a stronger Koopa.
- Her overprotective personality is similar to that of Lakilulu.