Possible Clues:

• 'The Avengers' villain, 2012
• God of mischief
• Trickster Norse god
• Evil Norse god
• Villain in 2012's 'The Avengers'
• Shape Changer, his mistress a large woman, her children monsters
• Low-key statement on deity
• Deity in the Edda
• Norse shape-shifter
• 'The Avengers' supervillain