Koopie Koo is Koops' overprotective girlfriend. She only 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 adamant 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 brave 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.