A character I wanna suggest is Wammawink from Centaurworld. While the show may not be as obscure to some diehard animation fans and she has a few pieces of porn, about 3 pages worth of smut on Rule34 and 161 results on e621.
Call me dumb with that take, but she has very few fat art. From the top of my head, I can recall like 4 pieces of fat art. It’s also a really great show. Although it’s on Netflix, the entire series is on the Internet archive. https://archive.org/details/centaurworld
Also wanna see more centaur stuff in fat art because I think it’s kinda cool to see the execution of the idea.