Danganronpa but it's written by someone who hasn't played Danganronpa
Kat the Cat for Sayaka Maizono
Sayaka is a relatively blank slate for the same reason as Aoi. Expect her to live longer than she normally does.
UPDATE: We've decided that Sayaka and Junko are a mean girl duo. You can factor that into your audition (or reaudition if you're feeling up to it). Here's a bonus audition line you may choose to do to get this aspect of her personality: "I wouldn't be surprised if your voice just didn't echo. The universe would never want to play such horrible sound more than once."
[Harshly Critical] If THAT's what your singing voice sounds like, you should stick to baseball.
[Confused] I mean... he died... does that mean we win?
[Exasperated] Great! I already deal with crazed fans trying to murder me, now the people trying to murder me aren't even fans!
