Everything that makes a character is part of the character. Race and skin color included.
Don't change things for no good reason. (And no, MUH DIVERSITY is not a good reason)
You have superheroes that match the desired race/sex! Use them! Expand on them.
Failing that, create new ones.
Don't frak with existing ones.
Fox has to make a Fantastic Four movie. And by has to, I mean they will legally lose the rights to the franchise if they don't exercise the option.
So if they are making a new FF movie, would you rather they just repeat the 2005 movie, with your standard cosmic ray origin story, standard Reed and Sue romance arc, standard Human Torch and Thing feud? Same exact chafacters that have been done to death by now?
I can't believe I'm defending this movie, because it looks like trash. But the casting of the Human Torch is not the reason for it.