Oh man, this will be long af but I'll try to limit it to 2 per series, don't think I can go any lower coz hating characters is why I play fighting games..
MK: Mileena, Kitana and Lao, annoying af every game it's unreal.
Tekken: Jun/Asuka, Whoreang and Bryan online
Injustice: the stupid ass Supercunts, if you have an S on your chest you a bitch.
SF2: Chun-Li and Guile
SF3: Ken, Ken, Ken, Ken, more Ken.
SF4/overall: Chun-Li and Blanka, easily. I can add 10 characters here though..
SF5: Abigail/Necalli coz 99% of their online players play like fuckin buffoons and press shit nonstop.
MvC2: #1 is Corridor, 99% coz of that fuckin assist. The whole top echelon in that game can eat a dick though.
MvC3: Zero and Hidden missiles.
MvCi: Dante and Haggar.
PreMvC: Wolverine my god, infinite galore from any hit.
SC: Voldo, just no.
Skullgirls: Double and Fillia, busted ass assist and a braindead character.
BB: Nine and Arakune, just no fun all around. Jin get an honorable mention coz fuck Ice powers.
DoA: Ayane.. flips, flips and more flips.
Uniel: 90% of the cast, it's why I don't play it anymore.
Persona: Yosuke, I'm not playing that BB crossbattle coz of him, fuck him. That and Uniel characters.
KoF: Iori and Benimaru, it's annoying how stupid good they are in every game at this point. Robert is a close 3rd.
Dissidia: Onion knight, Cloud for being so insanely overused.
KI: Fulgore and that bitchmade Mummy, haven't played in a while but fuck him.
Darkstalkers: Rikioh, such as asshole character.
GG: Zappa, but I hate everyone else as well.
Smash: LOL, but Mario.
Bloody Roar: Chameleon asshole.
SamSho: nakoruru, can't stand her and her stupid bird. Still mad she's in KoF14.
JoJo ps1: Chaka, Petshop for being bird ST Akuma with ice powers.
JoJo ASB: Bruno, those fuckin zippers..
FOTNS: Souther, he wasnt even the best but he was easily the most annoying. Fuck Rei too coz LOLunreactable everything.
Pokken: that fuckin chandelier.
Nidhogg: Orange, blends too much with the background.
Naruto games: the whole Uchiha clan, coz that's all you'll play against alongside Minato.
DBZ games: Broly, I really hope he doesn't make it to DBfighterz, most overrated and overhyped character in all fiction probably.