At my current job? The woman who works in purchasing that used to be my department manager. Controlling, pretty much wanted everything to through her, and we never saw eye to eye. She's in another department now and we don't interact much, but I also don't go out of my way to if I don't need to. She acts pleasant to me now but after having her as a manager I still don't like her and don't go out of my way to interact.
Then there was the front end head manager at my last job. Took heavy advantage of me when I offered to help on carts for a Thanksgiving/Christmas season by constantly moving the goalposts (my date of no longer doing carts back) constantly, even after screwing up my ankle, and was not pleasant to deal with when I was getting increasingly annoyed about being taken advantage of, and that she tried to loophole my urgent care limitations (by having me on my feet for four hours at a time before any kind of break despite ankle issues). When she left, conveniently after 3 other supervisors quit, she deliberately avoided me but was all friendly to everyone else.
First job had many. From the cashier who got promoted and immediately powertripped hard, to a 17 year old kid who was constantly late and unpleasant, to a guy that got hired as store maintenance and then was a whiny asshole over pay and whatnot until he left within 4 months, to the crazy Spanish lady who worked self checkout at night and was so nasty at times I avoided getting any of our baskets from self checkout or the carts she'd take from our dwindling supply outside to have them sit in the store for who knows what reason (they'd never leave and she'd snap at anyone who touched them). Maybe it was the FE department manager who was a total hardass and gave notices and writeups like candy and actually tried to outright blame me for a shortage one day (I couldn't say how it happened). She also constantly complained about the evening people and rumor was, one daytime cashier/assistant was basically her lapdog (and this person was almost as unpleasant and almost as much of a hardass too, I really didn't like her either).
I am a super sandwich!
http://www.last.fm/user/ToxicOrochi