Father is technically the better MU, but Belos and Voldemort just being unabashedly racist towards the other for most of the fight is really funny to me.

He isn't here but Makuta Teridax from Bionicle.

My personal pick is a bit of a guilty pleasure, being Toffee from Star vs the Forces of Evil

Father is better but

I wanna hear “dirty muggle” and “filthy witch” during the fight