I mean like the actual characters like how they did Adventure Time. =D
Sponsors typically come to Gaia, not the other way around. Then again, with the AT sponsorship where cash items were sold, I'm wondering if the sponsors got a cut of the cash made from the items. If that's the case, maybe Gaia COULD approach a sponsor.
I don't watch the new show and haven't watched My Little Pony or read any of the books since I was a kid. However, I think the ponies themselves are incredibly adorable and would not mind having more items on Gaia based on them.