A while ago I wrote a short blog post suggesting that Stan Lee is the Marvel Universe's equivalent of Clara Oswin (Dr. Who) because he seems to turn up in all sorts of times and places including the 1930s-40s (Captain America), 1940s-50s (Agent Carter), the 1970s to present day, on alien worlds (Guardians of the Galaxy) etc. etc.
Someone immediately pointed out that Clara Oswin must also exist in the Marvel universe - the same actress played Bucky Barnes' girlfriend in Captain America! Surely not just a coincidence...
I think that Munch is also one of these strange time-spanning people who turns up everywhere and everywhen.
