Sheep Nun: "Thank you for letting me have a towel Froggy, but the others need some too." Froggy Nun: "No, the "Hitchhikers Guide to the Galaxy" says that Towels are the most powerful tool one can have and considering I also stole Star's bathrobe I need all the power I can get my hands on."
The other 2 characters here are Unkaku (the one not listed at all) and Agakure (the one mistaken for Sora). They appear in Chapter 40 of the manga and thier names are revealed in Chapter 41.