Here are 15 Marvel Characters Who Could Defeat Thanos In Seconds. 15 Dormammu. He is the ruler of the Dark Dimension and one of Doctor Strange's most formidable foes. 14 Legion. 13 Matthew Malloy. 12 Mad Jim Jaspers. 11 Vulcan. 10 Squirrel Girl. 9 The Living Tribunal. 8 Galactus.