Juugo
Juugo has killed everyone he ever loved.
He does not remember clearly his mothers face or his fathers smile. He thinks he recalls an older brother and a younger sister, a grandparent, an uncle. In the end though, the faces he has known mesh into a bloody mess of hair and eye and nail.
For so long he walked the edge of inanity and prayed for death to take him, for madness to take hold, for someone, anyone to kill him; but it never came and he killed and killed and killed.
And then he met Kimimaro.
The boy was slight and not very tall and his eyes told a story of hate and betrayal and love. Juugo felt anger (though he does not know why) and when he raised his fist he found he could not hurt him.
Kimimaro was the first person Juugo touched and did not kill. Kimimaro was the first person to touch Juugo and not flinch. Thus Kimimaro became the only person Juugo loved and did not…no, could not kill.
So when he did die, that boy who made Juugo feel like a human and gave him hope that monsters could find happiness, Juugo promised himself to protect the one thing Kimimaro loved and to give up his life if nessesary.
He looks at Sasuke walking in front of him and wonders that, when that does happen, if anyone would remember or care about him…but of course, deep down, he knows that is wishful thinking.
Juugo has killed everyone he ever loved. Except one.
But he is dead now anyway.