
He's not a pureblood. If he was, he wouldn't have met Shiro in the dumps; he was even called a "dead dog" there (their race don't go calling purebloods that). I believe in the start of the manga, he was introduced as a foreigner brought in by a caravan. And it was even supported by the flashbacks of him and his Papan (definitely Dad) travelling (and saving Kojiro) and also by his Papan's comment: "I didn't come here for this (or something along the lines)."; meaning they really weren't from there. Well, that's my interpretation of the story so far. Could be I'm wrong, could be I'm right.
Well, we know where Anri gets his f**ked-upness from...lol What kind of mother goes down on her son (assuming she/he is his real "mother"). Also, poor Shiro...give him some more loves Kojiro.