“Koops... You're OK, right? You promised me you'd come back OK...”
—Koopie Koo, Paper Mario: The Thousand-Year Door
Koopie Koo is Koops' girlfriend. She appears in Paper Mario: The Thousand-Year Door. Koopie Koo pleads Koops not to join Mario's team and go slay Hooktail to avenge his father, but Koops is adamant about his plans. She loves Koops no matter what; he needn't prove anything to her in the game. She adores him despite the fact that he is weak. Koops wants to change 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 a strong Koopa. She has a tendency to be somewhat overprotective of him at times.
 Tattle Information
- 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?
 Names in Other Languages
|From ノコノコ Nokonoko, meaning "Koopa Troopa" and Rin, a female name.
||Portmanteau of "Koopa" and a common girl's name in Spanish, Patricia.
||Portmanteau of "Koopa" and a common girl's name, Madeline.
||Portmanteau of "Koopa" and "Sabine," a female German name
||From "Koopa" and the female name "Pamela"
- Koopie Koo can be seen in the Paper Game of the Pianta Parlor.
- Koopie Koo's over-protectiveness of Koops is similar to Lakilulu's over-protectiveness of Lakilester.
- She is one of the few Koopas, aside from the Koopalings, to have a different-colored shell and hair.