Sesshomaru

Sesshomaru is Inuyasha's older brother, a full demon. He is a very powerful demon.
His mother is a demon, so Sesshy is a full demon, not like Inuyasha. Because of this fact, he and Inuyasha don't like each other.
Although he sais everytime to Inuyasha that he's weak because he loves humans, Sesshomaru saves and takes care of Rin, a human child.