[@Inner Demon] After this battle though, I've already reached my character per battle limit, and Miyu still counts, useless as she is, and not actually really on Team Angel as she is.

And the only situation I can come up with for Zak needing Miyu is..

Henry: Alright, I'm going to stop you from getting the nebulous treasure, because I want all the things.

Zak: Darn. I don't suppose you'd like to look in that direction?

Miyu: Hey Heeeenry...

Henry: GRRRRRRRRR....

Zak: *bops henry while he's distracted*

But, Henry's already established Miyu's a side goal now, actual power always comes first.