Okay. After some thought (and some talk), here's what I have going down thus far.

Caim's turning into a Pikmin, so he can be a follower instead of a leader for once.
Soryk's going to spend the week as a peacock. Completely suited for him.

Ziio and Snake will remain unaffected by the upcoming shenanigans.

Eirika, Voile, and Nabooru are pretty much undecided and up for grabs when and if people should need [want] them.