Satan

Satan is the lord of Hell and Kush Diabetes' boss.

Pre-Hey Kush
Not much is known about Satan's life before the start of the series, except that he is the ruler of Hell.

Season 1
Satan sends Kush to reap the souls of Fondue Faker and Banjo Kannoli before the start of "Kush Gets Hey Kushed". Later, Kush calls him and asks for a transfer but Satan reveals he has used up all his transfers.

Personality
Satan likes to cause suffering everywhere he goes to everyone he meets, including his own employees, especially Kush.