Ozaru, Sasuke

He is a gifted ninja of the Sarutobi clan who had to flee with his father for their lives after the lord they served under was killed and other ninjas seeking vengence killed his mother.

Throughout the series Sasuke is learning new techiques and trying to help people he encounters while struggling with loss and loneliness himself.

[Spoiler] It is later revealed that he has an aunt who's his late mother's twin and four stepbrothers who look alsmost exactly like Sasuke himself. They are more prone to mischief and are rather easygoing but being part of a ninja clan means they help Ozaru family whenever they can. [/Spoiler]