Vivid Noise - Kirby 64: The Crystal Shards 

woah! i love the points made in this video, definitely got me thinking about game design. to answer your question, i don’t really consider any platformer game “2.5D” because, as you said, the term is really hazy. 2D platformers can have 3D graphics, like with donkey kong country returns or modern kirby titles. as for a platofrmer like klonoa or littlebigplanet? i’d just say it’s a 2D platformer with 3D gimmicks haha