At first it reminded me of the Apocalypse twins. They are known to wield Jarnbjorn, one of Thor's weapons and the were part of the Ragnarok Now event. But I think they are part of the X-Men property. But on the other hand, Thor: Ragnarok does feature artwork of a Negative Zone portal device that is owned by the Fantastic Four in the comics, so I'm not sure how the rights work when it comes to that.
My other best guess now would be Nighthawk. Maybe as a reference to him being an Avenger, like Thor and Hulk, or Defender, like Doctor Strange, Hulk, and Valkyrie.
Oh, and I also just found that Nighthawk was once manipulated by the Grandmaster.
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