10 Villains Marvel's Avengers Needs To Add!
3. Loki
Of everyone on this list, Loki is one of the most likely to appear in the post-game content. For a start, he's alluded to in a side quest for Thor, which sees Loki impersonating the God of Thunder to start a cult called 'The Woken'.
After he's discovered by The Avengers he's quick to flee, but not before Thor deduces that it's the work of Loki. It seems odd that Crystal Dynamics would introduce Loki not to develop him further down the line.
Another reason we can expect Loki is simply because he was the first villain that The Avengers faced off against. Playing such an important role in the legacy of the superhero team, it would be a huge missed opportunity to include the God of Mischief into the game. His use of illusions and trickery could make for a really fun boss battle, especially if he's able to impersonate the different Avengers.
It'd be a huge disappointment if Crystal Dynamics teased the character without plans to follow up on it. Fingers crossed we get some sort of confirmation for him soon.