characters belongs to Masashi Kishimoto
You now it's a lot of things why Kakashi cover eye, for exaple:
-considers that this scar is a blow to his honor
-discovered the secret of Danzo and got from him the Sharingan
-wound still hurts and he don't want to show a weak point to the enemy
P.S. I forgot about this eye
Found it while reading my manga dose for the week.
Had to look it up.