Mumm-Ra

"Ancient Spirits of Evil, transform this decayed form...TO MUMM-RA, THE EVER-LIVING!!!!"

-Mumm-Ra

Mumm-Ra is the main antagonist of the ThunderCats franchise. He is an undead sorcerer that is an eternal servant of the Ancient Spirits of Evil. Despite his status as a sorcerer, he is actually an evil spirit himself that took on physical form.

In various fan-made Power Rangers series. He serves as a major antagonist and as the primary one in some. Mumm-Ra often forms alliances with the likes of Rita Repulsa and Lord Zedd, often with a very poor relationship.

History
Not much is known about Mumm-Ra or his origins. Other than he is the personification of evil on Third Earth. Mumm-Ra is also the archnemesis of the ThunderCats. He aims to take the Sword of Omens and reclaim the Eye of Thundera, which once belonged to him.

Sometime in his lifetime, Mumm-Ra noticed the activity involving Rita Repulsa on Earth. Intrigued, he decided to travel to that planet and join the fray against the Power Rangers.

Personality
Mumm-Ra is generally described as a cold, ruthless, sadistic, and manipulative being. As he often shows zero mercy towards his enemies and is not hesitant to emotionally damage them. Mumm-Ra is even cautious towards villains he allies with due to concerns about treachery. When he finds definite evidence of them betraying him, he will betray them first.

In addition, Mumm-Ra is also a master manipulator. Unlike Rita Repulsa and Lord Zedd, (who prefer sending magically created monsters after the Rangers) Mumm-Ra prefers the use of manipulating the Rangers into doing his evil bidding and attacking them psychologically. Whether it's brainwashing them with illusions he casts, shapeshifting into the form of their deepest fears, or blackmailing them.