Butterfly Girl, or Papilio as a companion, is a monster in the second part of Monster Girl Quest: Paradox.
Monsterpedia Entry
Attacks
Strategy
Evaluation
"To be played with by the likes of a swallowtail butterfly... You liked catching insects before, didn't you? And it seems like you appreciate being caught by them too. The Butterfly Girl is not very strong but her scales can cause various status ailments. She can also use strong Wind magic so be careful. Because she is a demi-human status ailments are hard to inflict. It is best to just fight her normally. Now go, oh Brave Luka. Transform those swallowtail butterflies into insect samples."