Based of dreyga2000's Rescue from Scrappy Heap post and post this on the Marvel board since i post one in DC Comics section

When the audience hates this character, but the creator loves him/her and gives him/her more focus, engages in Character Shilling, etc. This usually makes the character even more hated. (ie. Felicity Smoak in Arrow, Sasuke Uchiha in Naruto)

Red Hulk/Rulk under Jeph Loeb's pen dear Lord... shortly after being introduced he beat odin-forced Thor with his own hammer, punched out the Watcher, killed the Grandmaster (who is immortal), casually killed off the whole Defenders (including the Silver Surfer!) and much more. Luckily, he got depowered when Parker took over, and every hero that has been beaten by him before returned to return the favor in some very satisfying ways. Thunderbolt Ross got later depoweres Post-No Surrender

The entire faction of The Inhumans was seen as this for a good while. For most of their history, they had been an inoffensive corner of Marvel's cosmic stable, but between about 2012 and 2018, mainly under the direction of Ike Perlmutter, Marvel attempted to push them as the next big thing and a replacement for the X-Men as act of devaluing the IP. However, the Inhumans have always been at best morally grey and more suited as supporting characters than ongoing protagonists, which meant the attempt to retool them as straightforward heroes couldn't be more of a square peg in a round hole. There were even attempts to treat them as the victims of Fantastic Racism - and as this is something the X-Men struggle with on their best day, a race of isolationist nobles who are only superpowered by choice never really had a chance with making it work. Pretty much every other event involved the Inhumans heavily, every other new character was an Inhuman or got retconned as one, and invariably, the only ones to have any success (mainly Ms. Marvel) were the ones to have basically no connection to the overall franchise. It certainly didn't help that the writers and editors had the bright idea to try to stoke the fires of the Fandom Rivalry by placing the Inhumans frequently in opposition to the X-Men (including the idiotic reveal that the Terrigen Mists kill or sterilize mutants). The period ended with the double-bill Franchise Killer of Disney acquisition of Fox and the TV series bombing hard, at which even Perlmutter could no longer deny their lack of value as a going franchise.