Thor (comics)
Thor, a founding member of the superhero group the Avengers, often battles his evil adoptive brother Loki, a Marvel character adapted from the Norse god of mischief. He is among Marvel's most powerful superheroes. Many recurring characters in his stories are based on Norse Mythology. Apart from this main superhero, Marvel features a number of characters based on him.
Surtr
In Norse mythology, Surtr (; Old Norse "black" or "the swarthy one") is a jötunn. Surtr is attested in the "Poetic Edda", compiled in the 13th century from earlier traditional sources, and the "Prose Edda", written in the 13th century by Snorri Sturluson. In both sources, Surtr is foretold as being a major figure during the events of Ragnarök; carrying his bright sword, he will go to battle against the Æsir, he will do battle with the major god Freyr, and afterward the flames that he brings forth will engulf the Earth.