Although it looks weak, he was a genius ninja who has sharingan, a lineage-specific ability Uchiha clan that he got from friends of the deceased, Obito Uchiha (Kakashi fri end while still a Chuunin, he died at the mission's yondaime). He was the type of relaxed and careful, but can be serious and act quickly when necessary. Often it is being seen reading a book titled Icha Icha Paradise! (Come Paradise!) That be by Jiraiya. One thing interesting Kakashi's mouth is never shown to the readers. Mouth is always closed, not only when he served time but good to sleep [with the Icha Icha Paradise books his] time and place of baptism in [with a towel]. In anime, Naruto, et al have tried to see the face of Kakashi, but their efforts failed.