This is going to be a difficult choice...
Favorites -in no particular order- :
Shikamaru: He's calm, collected and good at planning ahead.
Sakura: Ok, see was a whiny, annoying irritating fangirl early on, but she
changed, and I can respect that.
Hinata: Humble, kind and striving for self betterment, not to mention, she has Jyuuken.
Kakashi: Calm and balanced, knows when to be cruel, and when to be kind, when to kill, and when to defend, ETC.
Least favorites -in no particular order-:
Orochimaru: A creepy snake man who steals people's bodies, licks chops at the thought of stealing a certain boys body, need I say more?
Gai: My god, this guy may be funny, but he's too energetic and eccentric for my taste.
Sakon: "Lol, I has a twin brother living in me!".......