From the article, "Arranging a proper party of characters is just as important, as having people with the right stats for certain kinds of songs will make it easier to obtain treasures, cover ground, and defeat bosses. Especially since each character learns various skills as they’d level up.
Given that, you’d think that [Jenni Lada's] goal in Theatrhythm Final Fantasy: Curtain Call would be to create a well-rounded group of adventurers so I’d be ready for every situation. Well, it’s not. Instead, I’m putting together teams based on my ideal “one-true-pairings.”"