Possible Clues:

• Thor's foe
• Mythical god of discord and mischief
• Mythological trickster who was punished by being held to a rock
• Asgard mischief maker
• Evildoer of Asgard
• Gossip
• Father of Hel
• Legendary Norse troublemaker
• God whose name sounds like a word meaning 'understated'
• Marvel god with an alligator variant