From the Super Mario Wiki
“Well, I came here a while back to deal with Hooktail, and all was well and good... But just before my finishing blow, he played a trick on me and gobbled me down whole!”
—Koopley, Paper Mario: The Thousand-Year Door
Koopley is Koops' father and a resident of Petalburg. Ten years before the events of Paper Mario: The Thousand-Year Door, Koopley went to Hooktail Castle to slay the dragon, only to end up with Hooktail swallowing him whole. Believing his father to be dead, Koops eventually joined Mario's team to avenge him. After Mario, Goombella and Koops defeat Hooktail, Koopley emerges from her stomach with the first Crystal Star, the Diamond Star. Koopley had survived the ten years he spent in Hooktail's stomach by hiding in his shell.
That's Koops's dad, Koopley. He seems kind of out of it. Are all Koopas space cadets? Then again, Koops is really with it... Maybe that's 'cause his dad is like this... Anyway, Koopley does worry about Koops a lot, so I guess he's a good dad after all.
Names in other languages
|Portmanteau of "Nokonoko", the Japanese name for Koopa Troopas, and the Japanese male name ending "-kichi" (きち). Even the ending "-kichi" come from the Japanese translation for "luck" (吉).
||The ending "-pol" come from the English pronunciation for the male name "Paúl" (also it's a Spanish common male name).
||From "Koopa" and "Theodor", a German male name.
||From Koopa and "Pericle" (Pericles, a greek name)