This thread is not for shows where you hate the whole show.

Billy Connolly/Billy- Head of the Class. He was a big downgrade from Howard Hesseman the first four seasons.
Zack- Gilmore Girls. I preferred Lane with Dave, plus Zack was an awful singer to supposedly be a band leader.
Lisette- Night Court
Ann Cusack- The Jeff Foxworthy Show. Jeff's wife was recast when it changed networks for season 2. Anita Barone, the first Karen, was a lot prettier.
Ray Romano/Ray Barone- Everybody Loves Raymond. This is a rare case where the lead actor is annoying, but the supporting cast is so excellent the show is still worth watching.
George Dzundza and Paul Sorvino- Law and Order. These guys were the first two leads who didn't do much for the show. Jerry Orbach was a vast improvement.
Ashley Johnson/Chrissy- Growing Pains
Rachel- Boy Meets World
Jenny Piccalo- Happy Days. She should have remained an unseen character.
Torres- NCIS
Exidor- Mork and Mindy
Inspector Luger- Barney Miller
Nikolas and Lorenzo Brino (Sam and David Camden)- terrible actors
TJ- Head of the Class
Roselyn Sanchez- Without a Trace. The original cast of five was perfect.
Sam, Maggie, and Pearl- Diff'rent Strokes
Andy- According to Jim
Cousin Rose- The Waltons
Jeffrey- The Waltons
Robert Wightman- The Waltons. Imposter John-Boy
the preacher on Young Sheldon- I don't like him being made a regular for season 3.
Dick Sargent- Bewitched. Dick York was a much better Darrin.

Oh my God, I think I always hated Laura Winslow from "Family Matters". Yes, she could have a nice moment about once a year. Mostly though, it was difficult for me to relate to this really awful character. She believed that she was all kinds of awesome, while being a horribly shallow person with a really terrible taste in potential boyfriends. The way she treated poor Steve in the beginning was painful to watch. And despite all of this (and the fact that she wasn't even that pretty), every guy on this show was supposed to drool over her. Why?

I absolutely couldn't stand Levitt on Barney Miller. He goes down in my book as one of the worst TV show characters/additions to a sitcom ever in the history of television.

Jim J Bullock on Too Close for Comfort

I hated Noel on FRASIER.

I can't stand Eddie on Blue Bloods. I also can't stand Jerry on Hawaii Five-0.

Joe Randolph On The Adv. of Ozzie and Harriet

The Characters I cant stand are...

Judy McCoy - The Love Boat
Andy Moffett - The Facts of Life
Sam McKinney - Different Strokes

One that comes to mind for me is Kramer on Seinfeld, I guess hate is too strong a word but I just didn't like him as much as the other characters. He had his funny moments but mostly I think he was too weird and annoying. And there's no way I'd tolerate anybody just barging into my apartment without knocking whenever they felt like it. ETA: Most of the time I felt Kramer's personality was like fingernails on a chalkboard LOL.

Ed.

Paris on Gilmore Girls. Yes I get that she was supposed to be an unlikable, self-centered know-it-all but even when they had a situation where she was doing something that was meant to show her as more likable she just wasn't.

Ed.

actor David Ogden Stiers. I liked him as Charles Winchester on M.A.S.H. and in the episode of Star Trek: The Next Generation he guest starred in. But I can't stand him in anything else I've seen him in. His personality just totally rubs me the wrong way.

Ed.

Steve Urkel on Family Matters. He totally ruined the show for me and I eventually quit watching it just because of him.

Ed.

This thread was made for Chachi on Happy Days.