Gungans because it's fun to subvert people's expectations and have a Gungan PC that's a bonafide badass, and Ewoks just because I was still young enough when Return of the Jedi came out that I don't hold a grudge against the teddy bear brigade.
My favorite adversarial writing moment came with a Gungan Dark Jedi. Saber snap, hiss, "Mesa thinkin' yousa gonna DIE." Good times.
One of my early WEG groups had an Ewok that was barred from going near the ship's cannons ever again after he shot down the PCs' Y-wing. During a furball. Ah, memories...