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.
Fenrir
In chapter 34, High describes Loki, and says that Loki had three children with a female named Angrboða located in the land of Jötunheimr; Fenrisúlfr, the serpent Jörmungandr, and the female being Hel. High continues that, once the gods found that these three children were being brought up in the land of Jötunheimr, and when the gods "traced prophecies that from these siblings great mischief and disaster would arise for them" the gods expected a lot of trouble from the three children, partially due to the nature of the mother of the children, yet worse so due to the nature of their father.