so basicly Marvel post Secret Wars (2015)?
some know what happend (like the Fantastic4),
some know something happend but not what happend (Peter Parker knows Miles Morales is from an other universe but dosnt remembers the events that lead to Miles move to the his Universe),
some think it was always that way (like most normal Humans),
some changed and dont know it,
some are from an alternate universe and dont know it (like Bombshell),
some are from an alternate universe and dont know how they get here (like Old man Logan),
some are from an alternate universe and know how they get here (like Miles Morales)
and some are entirely new characters.