Niall: ...he's quiet. Normally he's always talking and laughing but when he's had a bad day, he just listens. Instead of replies he gives shrugs and mumbled nonsense.
Harry: ...he's self-loathing. He'll search up his name and bad things on twitter, frown in the mirror and exercise until he's out of breath, punishing himself for a bad day that wasn't really his fault.
Zayn: ...he's creative. He'll lock himself in his studio, painting and writing and drawing new pictures. He'll need some time to himself, to unravel and relax doing what he loves.
Louis: ...he's short-tempered. He'll roll his eyes and comment rudely at a lot of things but the next day he's apologetic and guilty, wishing he'd never acted that way.
Liam: ...he's cuddly. He just needs someone to give him a hug and give him warmth. He just needs to be reminded that he's loved and not alone.
