Don't hate any, but I find some annoying.

I don't hate any of them.

Not any that we're not supposed to hate at least.

Lavender, Bellatrix, Umbridge, Quirrell, and Pettigrew.

Bellatrix,Umbridge,Pettigrew,Voldemort,Dra­co.

I hate Lavender, Pettigrew, Umbridge and fudge the most.

Pettigrew, Voldemort, James, Umbridge and partially Cho-.-
God she annoys the Fudge out of me! Oh speaking of Fudge, I hate him too!

Well I almost Don't hate any characters but there always one or another that I can't stand

Dolores Umbridge, Cornelius Fudge, Romilda Vane Marietta Edgecombe and my more hated character PETER PETTIGREW

At times some of them annoy me, like Bella, Harry, (yes, Harry Potter) Fudge, Rita (I think thats her name), Umbridge, Wormtail, Draco, Snape, those kind of people.

But they only annoy me sometimes, not all the time.

Too many to list all, so I'll mention only the worst. :)
The Weasleys (I like the twins and hate the rest), the Potters, the golden trio, Tonks, Umbridge, Neville, Peeves...

more like half of them

Dolores Umbridge, Cornelius Fudge, Peter Pettigrew...Lavender Brown to some extent but shes more hilarous lol

Cho
Lavender
Fenrir Greyback
Peter Pettigrew
Dolores Umbridge
Percy Weasley

Rita Skeeter, Cho CHang, Ginny Weasley, just to name a few

Molly
Ron
Lavander
Sirus
and Cedric

Sorry to anyone whos favorite character I may have listed.

Umbridge. I have never truly hated anyone in my life, and I can easily say I hate this character. But I wouldn't not want her in the series, she's necessary to the story.

I hate Tonks, the Weasley family(except Ron and the twins), Cedric(a little because of this Twilight craze, but I hated him long before), Sirius(I didn't like him in the films), UMBRIDGE OF COURSE and Peter Pettigrew.
I'm sorry if I offended someone in this comment

I don't hate them, but I can't stand a few :

Harry, James, Umbridge, Skeeter, Fudge, Wormtail (well him, maybe, I hate him), Greyback, Percy and sometimes Sirius.

Bellatrix (for killing two fo my fave characters), Umbridge, Fudge (for being an idiot), Wormtail, sometimes Percy and sometimes Cho. I've actually learned to kind of like Lavender. (too much fanfiction!)

Fudge & Rita Skeeter

I hate Cho Chang and Pansy Parkinson

Umbridge

Lavender, Parvati, Pansy, Griphook, Snape (sometimes), Draco, Umbridge, Greyback, Bellatrix, Cho (sometimes), Fudge, and Rita Skeeter

Bellatrix, Wormtail, Voldemort.. A few more.

I hate Umbridge,Cho,Fudge,Rita,Cedric,Wormtail,an­d Percy. These are some people I don't hate but just can't stand...Harry,Pansy,Crabbe,Goyle,Greyback,­Ron­(so­met­ime­s),­Mol­ly,­Gin­ny,­and Viktor(he annoys me). Thats it and sorry if anyone likes these characters.

I hate Lavender, Hermione, Fleur, Cho, Ginny, Romilda, and
Bellatrix. They are all so damn stupid!

If they were real, I would hate characters like Umbridge of course, but as long as they're only literary characters, I love them all.

Fleur, Cho, Pettigrew, Ginny,........list goes on and on.

Lily, James, Sirius, Cho, Peter, Umbridge, Ginny, and Percy.

Bellatrix, Pettigrew, Voldemort, Umbridge, Fudge, Lavender, Marietta Edgecombe, Pansy Parkinson, and Malfoy.

@cuddlypandas Bellatrix is rather intellagent actually.