Rin Okumura from the anime Blue Exorcist. He lived like a "normal" human being til he was 15 years old. His father was an exorcist and so is his twin brother. That is until Satan took over his father's body and Rin was told the truth. He is the son of Satan. It freaked him out a bit and Satin killed his father. From then on Rin wanted to become an exorcist to slay Satin. Interesting right? Check it out if you haven't seen it yet.
Here's some pictures ^-^
And more... (O.O) ~fan girling~