Midgard Serpent (Marvel Comics)
Jormungand, also known as The Midgard Serpent or World Serpent, is a fictional character that appears in comic books published by Marvel Comics. The character, based on the serpent Jörmungandr from Norse mythology, first appears in "Marvel Tales" #105 (Feb. 1952), in the period between the Golden Age of Comic Books and the Silver Age of Comic Books.
Valkyrie (Marvel Comics)
According to a sentient, disembodied eye that claimed to have once belonged to Odin, the Asgardian monarch once gave his son Thor the mortal identity of the warrior Siegmund. Circumstances forced Odin to decree that Siegmund must be slain. Brunnhilde, recognizing that Odin was acting against his true wishes, sought to protect Siegmund, but Odin himself then caused Siegmund's death. Brunnhilde helped Siegmund's pregnant lover, Sieglinde get to safety. As punishment for her defiance, Odin removed Brunnhilde's Asgardian powers and immortality and cast her into a trance. She was eventually awakened by Siegfried, the son of Siegmund and Sieglinde and another mortal incarnation of Thor.