My eyes are pure black, the irises I mean...

Vincent, because he was left by his girl, she married Hojo, they produced Sephiroth.
He was the best, yet she left him.
His heart was left broken,
He died when he was 20,
and he is not man nor beast, he is both.

If anyone, (Aric, Mike, he-who-must-not-be-named) joins, please post here so I know my valiant efforts paid off.