Popular characters you cannot stand?

For me it has to be Louis & the Shishigumi.

Louis spends much of the manga just being a horrible person. So bad the anime omits his worst scenes entirely.

And the Shishigumi were ruthless criminals who kidnapped and sexually assaulted Haru, and bear and tried to murder Legoshi more than once.

Plus Pina who is an unrepentant Womaniser and Carniphobe.

Yet the fandom loves them.