Koka And Vikoka
According to the Kalki Purana, the twin brothers Koka and Vikoka serve as generals under the demon Kali, overlord of Kali Yuga. In their battle with Kalki, the 10th and final avatar of Lord Vishnu, the brothers display their mastery over the dark arts by raising themselves from the dead faster than Kalki can kill them.
Read more about Koka And Vikoka: Ancestry, Death, Similarities