What’s the worst character you can think of as the first 5 star? A character that if chosen, would annoy the most people, maybe even as a 4 or 3*. Either ridiculously impossible, or reasonably serious
Some of my ideas
Batman
Toad
J Jonah Jameson
Tony Stark (no iron man armor)
The Wall (absurd spiderman villain)
Considering batman is a dc character that would be weird
Groo the Wanderer.
Asbestos Man: http://marvel.com/universe/Asbestos_Man
He beat the human torch in a one on one fight, until Johnny cheated and tried to suffocate the good doctor. Asbestos Man should hold a place atop the marvel villain hall of fame and get to be the first 5 
(Another DC character) Wonder Woman and to make it even more wierd,her in a jump suit. One of her powers would be Lasso of Truth she’ll make you tell the truth to death.
Jarjar crossover.
Impossible Man http://marvel.wikia.com/Impossible_Man_(Earth-616)
Only has 2 colors both passive- Green and Purple
Green - Impossible Man pops back to full health whenever the enemy team uses an active power (only way to kill him is passives or match damage 
)
Purple - Any time a teammate tries to use an active power, Impossible Man redirects it to a random person (friend or enemy) excluding Impossible Man
Vampire Jubilee.
Lazy Squirrel Girl.
Another Wolverine.
Anyone from XMen 2099.
Juggernaut, yo. Same as the 1* variety, but scaled up to stupid. Both his powers would be the same, but cost 5 or less.
Yeah, that would pretty much ensure everyone would hate the shit out of him.
For names, we’ve got a few awful ones…
Paste-pot Pete springs to mind… Doctor Bong being another, well… Poorly named character.
If we’re thinking abilities/strengths, you can’t go wrong with Uncle Ben. Two colours, his 
would be ‘With Great Power’, reduces Spider-man’s match damage by half, as he makes him feel guilty for wasting his powers and 
‘Untimely Death’, where he instantly dies whilst reducing the health of his team by half, due to them all being guilty for not preventing his death.
Willie Lumpkin.
Agent Coulson
Doorman! he was a GLA member after all!
Bolivar Trask
I don’t want any 5*s added, no matter how cool or horrible. That said…
Fin Fang Foom
Howard the Duck
Wife-Beating Hank Pym
Lady Stilt-Man.