Bloodsport - now that I am looking properly at your signature I notice the order in which your girls are grouped up.

Dunno if you know about this, but it is recommended to let the AOE skill girls be first in line and the single target skill users finish the line up.
What it does is that the AOE girls wipe out either all the pests immediately or if its a boss fight, they wipe out the small ones, leaving the more powerful girls targeting the Boss with their attacks. (Kinda like I`ve put Sakura and Alpinia at the end of the line up)
Granted - if its a pure cosmetic choice - that you like that one certain girl being displayed as the team leader, and have her sprite run around then never mind me