User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 17: May 2013/@comment-10425110-20130604143708/@comment-4829046-20130604145636

I know what it means, but another user also uses Cpt. in his username so that just popped into my head. Generally it would be "Captain Byakuya" or "Byakuya-taichou"