>>83952453They were only popular with furries/waifufags.
The writers didn't like them and never used them (2 or 3 dedicated shorts total). Kids didn't seem to like them, probably because the few shorts they got weren't funny or were just too repetitive (the 2 Minvera shorts are clones of each other, likewise the 2 Fifi shorts right down to the resolution).
They're only popular in retrospect by neckbeards who jack off to them.