Captain America
There’s also Agent 13 a.k.a. Sharon Carter who we saw in The Winter Soldier; we also see The Hulk’s General Ross (William Hurt) get promoted to Secretary of State, Marissa Tomei as the new Aunt May and Martin Freeman (Bilbo, Watson) as Everett Ross of the State Department—who we may see in the 2018 Black Panther film (as he figures in the BP comics.)