Leviathan is one of the seven demon kings and chief of Hell's navy.
- Leviathan has large, beady black eyes and no eyebrows. He wears a hat and seems to have a very small nose. His skin is covered in scales.
- Leviathan was present during the events of Chapter 27 and Chapter 28, when the demons were coosing the Substitute King and Astaroth brought William Twining to Hell, as well as the awakening of Solomon.
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