Board Thread:Naruto Discussions/@comment-26567684-20150918015657/@comment-9782468-20150918123118

Kakashi. He's partly responsible for the deaths of his closest comrades, and he wasn't allowed to help in the effort against Kurama, which led to the death of his master.

I mean, first his dad commits suicide because the villagers shunned him for saving his comrade rather than completing a mission. This makes Kakashi focus only on the mission.

Then because Kakashi was focused on the mission and was late to help Obito save Rin, he loses his eye. This causes him to have a blindspot, which makes Obito have to save him, dying in the process. Also Kakashi now has Obito's eye as a constant reminder of his promise to protect Rin (and idk if anyone noticed, but whenever Kakashi has cried, it's only out of his left eye).

Later, using the jutsu that Obito's eye completed, he accidentally murders Rin, the girl that Obito made him promise to protect.

Then he isn't allowed to help fight Kurama, where his master dies.

Then that whole thing where Sasuke was being an idiot.