Are we talking characters that are annoying/unlikable on purpose? Because I'd go with Delores Umbridge. But if we're talking about characters that were meant to be charming/funny/likable, but you just find them annoying then I have one from a TV Show.
Argyle from Stranger Things.
So extremely annoying and unfunny. Stoner humour is honestly so easy to be funny and it was just a swing and a miss with him. I could not stand watching the show whenever he was on screen.