Regarding Hotel Dusk, I like the marjority of the characters, however there are three that I just don't like.
First one is Kevin Woodward; he's a complete douchebag and the way he treats Melissa is just awful. However, I give him some leeway due to the events that led to him being in the hotel in the first place.
Second is Helen Parker. She seems like such a sweet old lady, but she's just a lazy fool. You have to help her do every single freaking thing and she just keeps asking, stupid task after stupid task. During her story, I just hate how she CAN'T STOP saying how much of a fool she was and all that. Okay, granny, we get it! You suck! No need to repeat it 6 times in one single confession!
And last but not least, everyone's favourite, Martin Summer. I don't really need to explain why.
As for Last Window, the only ones that annoyed me were Dylan and Mrs. Patrice. Frank, Tony and Betty gave me a hard time at first, but as the game goes on they turn out to be quite likeable, while Will White, someone who many people dislike, was actually a very good "anti-hero" in my opinion. Dylan, on the other hand, starts off real nice (and I mean, like, the veeeeery first time you talk to him and nothing more) and becomes a pain in the ass. And I'm not even talking about creepy 'cause with that dumb face, the only thing he would creep would be a pigeon. Will White's sudden appearance on 306 was way more creepy.
Mags also starts off nice, even if she is a bit demanding over the whole rent issue. However, her constant "inviting-Kyle-to-chat" like she's hitting on him and then suddenly getting all cagey over her past after making Kyle talk about his pissed me off. If that wasn't enough, she decides to play villain and screws Kyle over and over, resorting even to assault. Then, at the end, she gets down on her knees, screams, cries, throws up, dies and revives only to say "I don't need help" to Kyle when he offers her his hand. Also, she's a woman who falls in love with a criminal, is very aware of it, gets betrayed by him, is very aware of it again, and even then lives her life like a freaking love slave. Hate women like her.