Thread:SunGodKizaru/@comment-4548390-20160507004444/@comment-5448995-20160525012831

Well the Hulks and the GoG nope, Zemo was a premium limited time character and he came back once, Pepper was also a mini event and might eventually come back.

Spider-Man and Winter Soldier are obtainable in this event, but as early unlocks, Winter Solider will be a main story character unlockable at any time and Spidey will be part of another event(guessing some spider verse like thing).

I'm not sure if the others will come back, but the game has only a few months, maybe trhey bring them back eventually.