Skin suggestion - Trainer Annie
In the spirit of Pokemon GO, Trainer Annie! She's already got the physical build and mannerisms of a kid running out to some adventure in the grass. Color up her skirt and backpack, put a cap on her head, give her a "Tibbers! I choose you!" line, and it pretty much writes itself. Instead of her standard Q, maybe she pulls out a little Charmander from her pocket to breathe on them or something >.> Frankly I don't have a lot of ideas outside of that, but it's just such a darn cute idea I had to throw it out there.
(To get ahead of this: Yes, I'm sure many of these actual Pokemon aspects are copyrighted, but that didn't stop Sail...i mean Star Guardian Lux.)