Adrian Swallow is Mycroft's father. In the anime, he died in a carriage accident and was taken over by Eligos.
- Adrian is a middle aged man with, seemingly, an perpetually stern expression on his face. He has short dark hair and somewhat thick eyebrows. He wears the attire of the nobles of Victorian England.
- Unknown. He seems to have been ruthless enough to make a deal with a demon in exchange for the soul of his son.
- Adrian was a politician. He had a carriage accident, in which he died, but made a contract with Eligos in exchange for the soul of Mycroft Swallow.
Amon and Mamon • Baphomet • Eligos • Gilles de Rais • Gilgamesh • John Dee • Lamia • Leonard
Belphegor • Empusa • Lamashtu • Leviathan • Lucifel Rofocale • Pluto • Astaroth the Second • Behemoth
Adrian Swallow • Barton Twining • Bianca Clifford • Elliot Eden • Mary • William Wynn Westcott
Arthur Christian • Cassandra • Ernest Crosby • Tamar • Elizabeth Dale