サンダルフォン

A black angel who possesses equipment similar to that of Metatron and invariably appears to confront the white angel. He is a member of the Black Lodge's inner circle but stands apart from all of them and shows little interest in fighting weaklings. 

Sandalphon is a master martial artist and the magical dynamo implanted into his body gives him superhuman strength. In addition his armour provides him with enhanced durability, flight, and a voice scrambler that hides his identity. His pathological hatred of Metatron grants him a measure of resistance to pain and allows him to endure otherwise crippling blows. 

Sandalphon typically plays a minor role in the story but becomes the primary antagonist in Leica's route. In her route, it is revealed that his real name is Ryuuga Crusade, Leica's brother and another test subject in the Moonchild Project. Although he was male and therefore did not have a real prospect of becoming the C Priestess, he was still experimented upon and had a magical dynamo implanted into his body, giving him superhuman combat ability. Although he did not know what the ultimate fate of the test subjects would be, Ryuuga still distrusted the scientists and planned to take Leica and escape. He loved the sky and his dream was to fly with the birds. Ryuuga's first escape attempt was successful but he was overpowered by Vespasianus, while his second attempt was cut short when Leica was manipulated into attacking him. He sustained severe injuries and was placed into a coma. Ryuuga's memory of the incident was distorted and he believes Leica killed him, causing the birth of a hatred that would eventually turn into an all-consuming obsession with killing Metatron. Vespasianus provided him with his equipment and gave him the name Sandalphon, making him an agent of the Black Lodge./

The name "Sandalphon" comes from the name of an archangel who is noted by some texts during the Midrashic period as the twin brother of Metatron. 

From url=http://en.wikipedia.org/wiki/List_of_Demonbane_characters#Sandalphon.

In Kishin Hishou Demonbane, Sandalphon has been brought back by Another Blood as nightmare for her "story". The real Sandalphon has been erased from history after the events of Leica's route./