User blog comment:B214/Question & Answers 5/@comment-66.87.80.141-20150504023426/@comment-3965848-20150504064440

Real name Tobio Ikuse, his is also the main character from Ishibumi's other work also titled Slash/Dog which is in a shared Universe with DxD but takes place before the series.

He also has a Grandmother who was part of the Himejime Clan, making him a distent blood relative of Akeno Himejime.