Reggie generally gets along poorly with the others, though how much of a jerk he is differs Depending on the Writer, but is still usually a part of the main group of friends.
Ethel is normally mocked by most of the other characters but is usually present, especially if there's a large group at a party or other social gathering.
Condorito: Pepe Cortisona is disliked by the other characters (particularly the titular Condorito) for being an uppity, bullying jerk, yet there are times when they hang out with him, if begrudgingly.
Tosahwi in Deadly Class. As Zenzele puts it, "He hangs out with us almost by default. He has no one else, so he buzzes in our periphery." He's extremely angry and unpleasant and it's not at all exaggerating to say that nobody likes him, but Helmut can't avoid him because they're roommates, and Zenzele and Quan are Helmut's friends.
Julie from Scott Pilgrim. The only reason the main characters spend any time with her is because she is Stephen Still's on-again off-again girlfriend. And she throws regular parties.
Scott himself to a minor extent. All of his friends regularly mention how much they dislike him, even if in a semi-joking manner. He doesn't seem to mind too much. Knives is the only person of the group who fully likes him (without ever badmouthing him) and she has Stalker with a Crush tendencies.
The main reasons seems to be Seniority and because he holds them together. From an individual standpoint of each character, they've known him the longest compared to the others. Beyond that, he seems to be the main thing they have in common, being friends with Scott.
However, it's clear that they do care for Scott and he for them; one could say their snark and exasperation is a form of Tough Love.
In The Transformers: More than Meets the Eye, there are maybe three people on the Lost Light who like Whirl. At one point, Swerve threw a costume party with the theme "People You'd Like To Punch"; Rodimus describes himself as 'a lone Megatron in a sea of Whirls'. Megatron is also not exactly popular when he joins, for multiple obvious reasons.
Elsewhere in the IDW Transformers continuity, specifically in The Transformers: Robots in Disguise, Prowl's Well-Intentioned Extremist, end-justifies-the-means shtick has earned him a great deal of enmity among the other Autobots; when even Optimus Prime is sick of you, you've officially burned through all your residual good feelings.
In The Transformers (Marvel) during Simon Furman's run and The Transformers: Regeneration One, Kup is pretty much hated by the Autobots due to his constant questioning of Optimus Prime's orders due to the fact that said orders are almost always the right ones (such as surrendering to Scorponok for an Enemy Mine situation against Unicron). Roadbuster makes it clear during Destiny Part Two in Regeneration One, that if it weren't for the fact that if Kup weren't so good at battling Decepticons and leading the Wreckers (and even then barely), the elderly Autobot would have been shown the door a long time ago.
