A thery on why kakashi wear a mask I got this theory and I need to get it out of my head and I might aswell get it out and put it right here. So after we have read the kakashi gaiden under these weeks we have found out that kakashi had some family problem and that's no a very uncommon thing in this series. However, yondaime said that kakashis father was great and all that and that he chosed his companions lives and broke the rules over the success of the missions. And becuse of that, he was disgraced by the village and even his companions. So that lead to the conclusion that kakashi is ashamed of his father and is ashamed that his face looks so much like his father, that's why he hides his face. And so, over the years wearing his mask he get used to it and won't take it of, even after he gets over it, about his father I mean. this is my theory, if you got your own, you could just write it down here.