There aren’t really that many. The WWII characters, certainly. But even there, if you really wanted to you could eliminate Fury’s WWII-era backstory (it comes into play so infrequently as it is.) The Punisher too could possibly be moved forwards in time to a different conflict, although everybody’s been reluctant to do that–so it’s possible that Vietnam is also too important a part of his backstory to jettison.
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