Harry - He likes to take the meat of your side, twisting it and pinching it. It annoys you so much, because he does it in front of fans and it makes them think your over weight. After a while, Harry notices it and he knocks it off a bit, reminding you everyday your perfect to him.
Liam - He likes to steal the blanket from you at night. He thinks its funny, but waking you up in the middle of the night because of a cold chill, isn't all that funny to you. But after a few nights of getting smacked in the side, you decided to sleep with your own blanket.
Niall - He likes to take food from your plate. Niall is known for the snack guy of the band, and literally he's like that at home as well. Whether he's taking a chunk of meat from your plate or a single cookie, he's always got his hands in your food.
Louis - He likes to blow in your ear. During dinner, when your asleep or when your trying to get work done, Louis is always annoying you by blowing hot air in your ear. Sometimes he does it a lot and other times it's a tiny blow, but either way it still annoys you.
Zayn - He likes to change the channels on you. You could be interested in a new episode of your favorite show or at the climax of an awesome movie and Zayn would change channels completely. Of course it makes you mad, but TV never seems to interest Zayn, he can never stay satisfied on one channel.