Sam Winchester is

Super nerd, compared to Dean anyway and I swear Sam seems to know almost everything anyway

A psychic, he has dreams of the future and can move something's with his mind because of some demon blood he drank as a kid

Misses Jessica his girlfriend so so much, she died the same way as his mum

Will never give up on anything, as long as he can help someone no matter what unless Deans in danger

Insanely cute before he starts parting his hair and I love his eyes

Never wanted to be a hunter, Sam wanted to be a lawyer

Courageous, because you can't be brave without being a little scared as well

He is the most understanding and kind person I can think of in Supernatural

Enormous, he must be the tallest person in America

Student at college until Dean turns up in the middle of the night and begs Sam to hunt with him
Tries not to lie more than Dean but doesn't really succeed
Egoistic but not as much as Dean

Really doesn't like his dad as his dad kicked him out but he's family so Sam wants to find him anyway