Daenarys Targaryen from Game of Thrones takes that title for me, and then some.
I wouldn't dislike the character so much if so many people didn't insist on white washing her and making her out to be super nice or kind, when she has shown to be just as petty, cruel and vengeful as any other ruler in westeros, with about 10 times more entitlement, damnit the throne is hers and she deserves it cos she has dragons and can burn to death anyone who disagrees!
Dany in show also has some odd moments of pandering girl power in ways the book version never did, "All men must die...But we are not men..." booya! Yeah, wimmin too strong to die!

(in book she never says this and in fact draws the opposite conclusion, that all men must die including her, a very interesting change).
Dany is always portrayed as being in the right or at least in a positive sympathetic light with everything she does and seems to have moments designed to pander to the SJW types to keep them satisfied in between complaining about Samsa Rapes, Dany literally burns down the patriarchy at one point, to the glee of countless media articles (why the roomfull of big burly men never try to attack Daenarys which would be the most obvious thing to do I'll never know, guess gotta have her gloat and look all triumphant), and makes such crowd pleasing speeches such as "I'm not going to break the wheel...I'm going to SMASH it!" (she is talking about the politics of a land she doesn't understand and has never been been to..But it's ok, because it's Daenarys

!! Woohoo you go girl!)
So yeah fuck Show Dany. Smug, insufferable git with annoying plot armor in a show where you genuinely don't know who is going to die, it seems a safe bet that Dany is going to be laming it up all the way to the end, and will probably be the one to end up on the Iron Throne. Which makes the character even more insufferable.