Walt Simonson’s brilliant creation of Malekith the Dark Elf in 1984 is one of Thor’s most complex and best designed villains, second maybe only to Loki.
This is on dusplay currently both in the comic, Thor: God of Thunder, and the second cinematic offering for the hero, Thor: The Dark World.
Malekith started his villainous career out right when he struck an alliance with Loki on behalf of the fire demon Surtur. He took control of a number of Earth humans using special food of the faerie provided by Hela. Malekith then killed Eric Willis, guardian of the Casket of Ancient Winters, after learning its location.
As Master of the Hounds, Malekith hunted down Roger Willis, Eric's son and new guardian of the Casket. Malekith battled Thor, and kidnapped Lorelei. Using Lorelei as bait, Malekith forced Thor to battle Algrim the Strong, one of his Dark Elf followers, then attempted to destroy both combatants by plunging them into a pool of magma.
When he captured the Casket from Willis, Malekith was ultimately defeated by Thor …but not before he destroyed the Casket, releasing magical frigid force all over the Earth. Malekith was then brought as a captive by Thor to Asgard.
Malekith later disguised Loki as himself to take his place in the dungeon, while he disguised himself as Balder the Brave, who was about to be crowned ruler of Asgard. Kurse, the being formerly known as Algrim, saw through Malekith's disguise when he reached Asgard City. Kurse then broke Malekith's neck, slaying him! (Well …)
Malekith as a Dark Elf possesses superhuman intellect, strength, speed, stamina, durability, agility and reflexes but all developed to a high degree. He also has the ability to manipulate the forces of magic for teleportation, energy projection, physical malleability .., usual Doc Strange package.
Malekith has a vulnerability to iron, which disrupts or cancels his magical spells
And apparently he has a flying white tiger he can ride, like Thor’s goat.