Inari Lirun, the party's halfling oracle, can turn into a Medium water elemental. Also known as...
Mahou Shoujo Splash☆Inari!
...I'll start drawing people in other poses soon, I swear. I just have a habit of making a "rough design sketch" and getting carried away.
EDIT: A rival appears!
Mahou Shoujo Slash☆Alveri!