About: Nathan Beelze is a high-ranking demon with close ties to the Shokushu realm. He is a master of magic, specializing in hypnosis and mental spells. Though he is amused by humanity, he wouldn't normally be caught in a human school; however, he does so out of concern for his younger brother, Allan. Nathan is very protective of Allan, and jealous of anyone who manages to get close to him.
His hair is black, rather than red, and is shorter. Nathan's outfit is derived from Sirzechs excluding the large shoulder plates however. He's also a very powerful demon with similar magic abilities. Despite having similar last names, Sirzechs and Vali are not related in the series, the former is an older brother to Rias instead. That said, the two are brothers in GH.