This is Waka from Okami. He's my second favorite character. My favorite is Amaterasu and my third favorite is Orochi.
The name of his sword is Pillowtalk. I remember something funny in a game forum about that. Someone was playing the game with a friend watching him. When he saw what the name of his sword was, he said that he turned the TV off and him and his friend sat there very quietly for three minutes.