If Marvel did an AU without the sliding timescale, what characters/teams would you put in which eras?
Imagine Marvel made an alternate universe line of comics in which there is no sliding timescale, and the Marvel universe has had a bunch of superheroes since World War II with no period without major heroes.
(Context for those who don't know: Marvel uses a "sliding timescale" in which pretty much everything in comics that has happened since the Fantastic Four first debuted has taken place in the last 15 years)
How would you design the timeline? What characters/teams do you feel NEED to get their start in the "modern" era, which ones do you feel would comfortably fit in past decades? Where would you put them?
I feel that the X-Men in particular are a team that could comfortably start in the 60s and continue into the modern day. The team has had so many different rosters over its history, it could easily be adapted to be a team with decades of in-universe history.
The Fantastic Four (as Marvel's "founding family") also make sense to me as a "historical" team. They could have been the world's primary superhero team in the 60s & 70s. If you really want them to show up in modern stories you could even pull a Captain America and have them vanish and reappear in the modern day (Negative Zone or time travel shenanigans perhaps).