Saw this exact question being asked in the peepshow subreddit, which I’m not subscribed to but came up in my recommended.
So thought I’d ask it here, my favourite minor character from South Park has to be halfy. He was literally in like 2 episodes and then we never saw him again :'(
Who’s yours?
Halfy was great, but the Underpants Gnomes take the cake for me. Their business plan still cracks me up every time.