Look, I came up with this idea on the fly. Whether or not it sounds unoriginal.

A spell had been casted on the world centuries ago, which caused people to be unusual centaurs; Their upper half was generally their own, but from the waist down, there was a shoulder base which had a full anthropomorphic body, but most of them didn't have human-like feet, or mismatched upper and lower body orientations. But they were considered normal variations, and it wasn't limited to just the animals from earth, there were mythical creature variations, beasts, etc. It was all the norm. And all bipedal too.