000
Obito
Obito has a dream, something he wishes for with a burning desire and will do anything in his power to accomplish – he dreams of being Hokage and protecting his village and winning Rin's love.
But more important than any dream, Obito has his friends, his precious people who have each taken a place in his life, in his heart. He has Rin, Minato-sensei, Kushina-nee and yes – even Bakakashi (sometimes), and Obito would give up anything for them, without any second thoughts.
It happens in the blink of an eye. The ground is shaking, the cave is collapsing, rocks are falling down over them – and stupid Kakashi is knocked out. A split-second decision and it is no surprise when it comes down to it – choosing between chasing his dream or saving his teammate – what Obito picks.
So, he gives up his dream, he gives up his life for his friend's, and it is all instinct, really. The drive to protect his family – the one he has found and loves so much.
Obito doesn't regret taking Kakashi's place under the boulder, even if it means losing the chance to prove himself as a Hokage, even if it means never getting a chance to tell Rin what he feels for her.
What Hokage would he have been anyway, if he would've let a comrade die? How could have Rin loved him anyway, if he would've let that which she loves die?
In the end, he gifts his eye to Kakashi – because as stupid as the jerk can be, Obito cares for him as much as he does for all of their team – and with it, all he has ever dreamed of.