[hasbroherofan]

Something that should be taken into account with the FF thing is that in this case, the line-up was likely chosen to appease retailers. The Fantastic Four have not had any sort of mainstream pop culture presence in quite a while; their last TV show was close to a decade and a half ago and their last movie (which bombed) was four years ago now. That's not to mention a lack of video games and the like.

So they're not a strong brand right now like the Avengers, Spider-Man or the X-Men, and it was likely decided that any retail wave for the franchise had to have the four leads themselves plus Doctor Doom, since he's their most popular villain. Even with She-Hulk, the Hasbro reps basically all but confirmed her inclusion was due to it being announced that she was coming to the MCU.

There are definitely some lesser known characters I'm sure fans would've liked to see like the Mole Man, Wyatt Wingfoot or the Wizard, but coming out with the big guns blazing makes sense.