(Character description taken from comicvine.com)

Kakashi has a dynamic personality. He was shown to be a very stern and serious ninja when he was much younger. He strictly followed orders and scorned anyone who disobeyed them. This caused some friction between him and his then team-mate, Obito Uchiha. Obito was eventually mortally wounded in battle and this caused a change in Kakashi's attitude. He now has a more carefree and laid-back personality. His personality is further emphasized by his generally lazy expression, aloof manner, relaxed voice, and minimalist attitude. However, Kakashi can still be as emotionless as he was during his youth, often speaking bluntly about sensitive topics. In serious situations, he is shown to be extremely serious and calculating. During battle, Kakashi is known to first send out clones of himself in order to study and analyze his opponent. Despite his increasingly growing reputation and prowess as a ninja, Kakashi has shown no signs of arrogance, and is rather modest about his abilities.Kakashi is often late for appointments because he of his frequent visits to the memorial where Obito's name is engraved, where he loses track of time. He once said that he lost everyone that was close to him. This has caused some reluctance to allow himself get attached to people or allow people get close to him. Despite this, he cares deeply for the members of his team and his friends.