Thanatos, God of Death
Thanatos is an important part of the Unspoken Gods universe, despite being underrepresented in Greek mythology. He is a companion to some of the characters created just for this project, and makes many appearances throughout the history of it.
Living in Hades, he spends much of his time with his twin brother, Hypnos, and helps Hades when necessary. Along with Hypnos, he also spends time with Pluto, who calls on the twins when he needs some extra hands.