Jocular in nature, Dean is a hunter with his brother. He’s been through hell — literally — and is the vessel of the angel Michael. Of course, he refuses to accept Michael into his body. He has training in fighting, and has fought angels and demons.
Unlike his brother Dean, Sam is more calculating. He thinks things through carefully before going into battle. However, his thoughts are sometimes skewed when he believes that he’s doing something for the greater good. Sam is the vessel of Lucifer, and he has accepted the fallen angel into his body before. At points, he was addicted to demon’s blood, giving him demonic powers.