This crazily epic panorama of cosplayers from MCM London ComiCon by Frazer Brown seems to contain the entire Marvel Universe.
Okay, not quite, but beyond the obvious like Spider-Man, Black Widow, and Captain America I see Bucky (plus Winter Soldier) Firestar, Cyclops, Nick Fury (old school), Iron Man, Red Hulk, War Machine and so many more. Basically it's all the Marvel Cosplay you could want in a single photo.
Did I mention Polaris and Psylocke because they're in there too...
Source: Bleeding Cool