Most annoying character ever
Not so much annoying as frustrating — Vernon Dursley, Harry Potter’s uncle. Every book he’s coming up with new and exciting ways to torture Harry, and he stokes the ire of every kid who’s ever been brushed aside so casually by an adult. (So, every kid, pretty much.)
He was meant to embody that character we all know and love so well — the one who disregards everything you say simply because you’re too young/old/inexperienced/too experienced, have black/red/blonde/green/purple hair, are a certain person’s offspring/not a certain person’s offspring, have special abilities that provoke jealousy and, possibly, fear/don’t have any special abilities at all. This person might go farther than mere disregard and punish you for being, well, you.
I’m not sure if I’d necessarily call that annoying. It gets to a point where you don’t allow yourself to feel anything more than annoyance, because there’s no point. But at the beginning, the feelings this treatment arouses are definitely more akin to rage.
However, I can’t think of an actual annoying character, so this is what I’m writing about.