For me, I would have to say Minx fom the episode 2-D Blacktop. https://theinfosphere.org/Minx
I just feel her backstory is annoying and way too drawn out. It really doesn’t add anything to the episode just detracts from the enjoyment for me.
Santa Clause bot. All of those episodes annoy me.
Frieda Waterfall Jr
100% Dr. Banjo
Gotta love the crazy lady living at the nursing home with Harold Zoid. Some of the best Tress Macneille noises ever.
Edit: Turns out the question was Least favorite. Thank you brain for omitting key words while reading, and having me instead post a favorite.
Ok, right. Don’t come for me.
spoiler
::: A lot of the time it’s Leela
I get your point and im pretty sure its not that unpopular, but i think that she was set up this way on purpose to contrast the other characters for them to stand out more. Most of the time she’s that paper while the other characters are the crayons.
I get that she’s supposed to be the straight man. But also sometimes she’s just awful all by herself. I stand by it lol.