I'm very much a fan of Earthspark, the blend of 3d animation with stylized 2d particles and effects like the smoke has to be some of the greatest.
The fight scenes are some of the best-choreographed fights I've ever seen, in any media and there are plenty of in-jokes and references to other things in pop culture.
There are quite a few great morals taught in here and it really shows to love and not hate and encourages the audience to think harder about topics.
It handles all of its characters, both legacy and the new characters introduced here very well, even if some characters appear infrequently.