I have an attack on Titan preference book as well as a Levi fan fiction called pearls. Seems interesting? It's in my profile.
Steve-
He would make a good commander, and you'd be captain, always by his side. In the Survey Corps.
Tony-
You'd be in the Military Police. He'd be in control of the new recruits, as well as you.
Thor-
The Garrison. You'd both be stationed at a gate, protecting the people.
Clint-
He would be a squad leader in the Survey Corps, and you'd be in his squad. (You won't end up like Petra, I promise).
Bruce-
He'd be like Hange in the Survey Corps, studying Titans. You'd be a squad leader.
Natasha-
Military Police, stationed near the king, protecting him.
Loki-
The Garrison. He's stationed at a gate, you're stationed at another gate.
Bucky-
Military Police. You'd be controlling the new recruits while he's near the king.
Pietro-
Survey Corps. You'd be a squad leader, while he's in your squad.
Wanda-
The Garrison. Stationed at a gate.
Just imagine them as anime characters. *nosebleed*