Heya,
I'm reluctant to add original characters officially for legal reasons. Those characters are not my property so it would add some complications.
I'm interested in perhaps doing a paid reward (~$200-300?) that comes with an image set but I'd need explicit permission to do whatever I want with the final result. It'd also have to be very clear that this is not an investment and you aren't entitled to royalties just because your original character is featured. I'd be very careful about who I'd be working with if I wanted to do that @w@