Thanatos

Appearance in Ben 10
Thanatos is Pluto's messenger, god of death and collector of dead soul. He appeared in Devil's Triumph (2). It seems that Thanatos has rivalry with Saturn to replace Pluto's throne. Thanatos became Plutopolis East Duke and Saturn became Plutopolis West Duke and reconciled. Thanatos and Saturn became members of Ethereal Plumbers.

Powers
Mana

Staff of Hades

Shape Shift

Immortal