I've always got a soft spot for sarcastic sidekicks. Some of them are pretty well remembered, like Kenzi from
Lost Girl, Maria from
Roswell, and Doyle from
Angel (although he sometimes gets overshadowed because he was only on the show for the first 9 episodes). But there are a couple others who are favorites of mine from shows that it seems like no one talks about:
Thelma from Hex. The show overall could be quite dull at times but it was always spiced up thanks to Thelma, the wisecracking lesbian roommate. Given that she was the best part of the show, I was bummed when she was killed off in the first episode. But it turned out fine because she came back as a ghost and was still regularly haunting Cassie. Even when she wasn't in a scene, she could still provide some of my favorite moments of the show. There was one scene where Cassie seemed a bit distant & distracted (which would make sense considering she had recently given birth to the spawn of Satan). One of her classmates went up to her and asked her if everything was OK. Thinking that she still might be mourning her dead roommate, he asked, "Is it Thelma?" To which she replied, "Oh, no, Thema's fine. She's actually been a lot better lately...." trailing off because she suddenly remembered that Thelma is a ghost that no one else can see.

Chuck Fishman from Early Edition. Much as I liked Gary Hobson, the show was nothing without his constantly scheming friend. I don't know why he left after Season 2 but it just made the show nowhere near as good.
And a few more of my forgotten favorites:
Dr. Kurt Mendel from Odyssey 5. Actually, I miss everyone from this show and it's an absolute crime that it was canceled after only 1 season. But Kurt was my favorite. Apart from sarcastic sidekicks, my favorite character type is asshole scientists and, IMO, Kurt belongs on the Mt. Rushmore of them, right next to Gaius Baltar from
Battlestar Galactica, Dr. McKay from
Stargate Atlantis, and Dr. Rush from
Stargate Universe.
Lt. Ford from Stargate Atlantis. Not that he was necessarily the best character on the show. But he was a thoroughly underrated one and writing him off of the show threw the entire cast out of balance. By having a young, naive, and relatively unassuming military officer as part of the main cast, it brought out different sides of the other characters. Maj. Sheppard had someone to order around. Teyla had someone to be motherly towards. Dr. McKay had someone that he could pick on with impunity. The show lost all of that when they replaced him with Ronon Dex. He wasn't a member of the U.S. military, so he didn't have the same kind of formal relationship with Col. Sheppard. He was also big & intimidating, so he didn't inspire motherliness from Teyla. Dr. McKay didn't dare make fun of him due to the implicit thread of an ass whooping. Also, by being yet another stoic alien warrior, he ended up infringing a bit on Teyla's role on the show. The later seasons are still good but I think that the loss of Lt. Ford was a big part of the reason why the show never quite recaptured the initial chemistry of Season 1.
Jaye Tyler from Wonderfalls. This is another one where most of the cast could make this list, especially since I've got a bit of a crush on the actress that plays Jaye's sister.

But Jaye herself is perfect. It's like the sarcastic sidekick finally got to be the lead on her own show. It's a show that really spoke to me, since I also felt very over-educated & directionless at the time. And I still choke up a bit whenever I watch her breakdown after Eric left. "I let him go. I had to let him go. I didn't want to let him go. I wanted to keep this one. Why can't I have nice things?"
John Doggett from The X-Files. I don't know why I seem to be the only one, but I actually liked Doggett way more than Mulder. I loved Doggett's no nonsense personality. He was skeptical about all of the paranormal stuff but wasn't trying to rationalize it away. And there's an intensity to Robert Patrick's performance that I really appreciate. And while I wouldn't say that
The X-Files is forgotten at all, it seems like Doggett has been a no-show ever since the end of Season 9. Has he even gotten a name drop in the revival series?