Okay, RSF. I just got my own GameBoy Advance ROM making kit -- not hacking, but able to make it, as in code it and then upload it to a cartridge.
I have a ton of resources that I'll be playing around with. I'm still a wee bit off from making my first test ROM for GBA, but in the long term, I'm hoping to initiate a project for Chrono Trigger Advance, which will have a few earnable extras such as Schala as an eighth character.
I think your sprites would be pretty swell to use.