Malekith the Accursed is a fictional character appearing in American comic books published by Marvel Comics. He is the ruler of the Dark Elves of Svartalfheim, and has come into conflict with Thor. He once wielded the Casket of Ancient Winters.
Malekith the Accursed escapes from his prison in Thor: God of Thunder #13 (2013) Art by Ron Garney
Christopher Eccleston as Malekith as he appears in Thor: The Dark World.
There are many fictional Elves appearing in American comic books published by Marvel Comics. The most common of the Elves are the Dark Elves of Svartalfheim and the Light Elves of Alfheim that are based on the elves of Norse mythology. They frequently appear in stories featuring the superhero Thor.
Grendell the Dark Elf on the cover of The Mighty Thor vol. 1, #377 (March 1987). Art by Walt Simonson.