Because honestly, the only thing that I could see Gemma being a maven of is mischief. :)
This picture started out as wanting to draw Gemma in a more "traditional" Kingdom Hearts style outfit. It...kinda morphed so now she looks like an odd cross between Atelier Rorona and Kingdom Hearts...ah well.
This outfit makes me believe she's either one of two things:
1) She's obsessed with gummi ships and she tinkers with them or something...maybe she's apprentice to Chip and Dale?
2) She's an alchemist of some form (or whatever you want to call item creation)
Well whatever the case is, this was just for fun and really has no bearing of Gemma or her story. :) But, I find that Gemma has been demanding to be drawn recently, so you may just see more of her in the future...
In other news...OBNOXIOUSGREENBACKGROUND!!!!!!