Hi! Hopefully we'll get more responses on comics and superheroes, but there have been a few threads on related topics which I think are worth sharing here.
start here ---> /u/bufus gives a great introduction to Soviet culture, and how that was expressed in entertainment media: During the Cold War, did the Soviets have their own James Bond character in the media? A hero who fought the capitalist pigs of the West for the good of Mother Russia.
/u/restricteddata talks about heroic Soviet characters: Did the USSR have any kind of attempt to appeal to the youth similar to how Captain America got big in the US?
an old post on Soviet comics: Did the Soviets have comic book heroes?