For me it is Zoro from One Piece. He showed us of what a true friend should be and it was clear after thriller bark final fight (the scene Kuma showed up to take luffy's head). Kuma's mission was to kill luffy but Zoro intervened. He was willing to die in Luffy's place because he recognize that luffy's dream was much more important despite knowing that he will surely die. When he survived, he didn't want any recognition of what he did because Luffy will feel bad for it.
There are other great scenes from Zoro like Luffy vs Ussop.
Zoro is the best character for me.

Thank you for having time to read. :)