No S-curl or trunks.
No Blonde hair.
No waves.
No... really anything Star Lord whatsoever.
Even if you take just the costumes, they are best are only rough approximations of what's in the comics. Amazing 2 and Iron Man are probably the closest? Once again? I have no clue where they were going with Scarlet Witch.
This isn't making the argument obtuse. This is arguing that everything is already changing, so drawing the line at this seems odd.
Caring about visual signifiers, okay, but what is the character about? Does this version of Mary Jane fit with this version of Peter Parker? How do they interact? What kind of relationship do they have? I find these more important than her hair or race. And for a grand number of characters, these traits do not define their characters in any fashion.
Steve Rogers is a good example of one where it does: given the time period he is directly from and he function there as a propaganda tool, having be non-white would drastically change the character. He needs to be white. He doesn't need to be blonde haired and blue eyed, that's just frosting. But white? That's a big facet of the character.
There are others, but for many? You can do whatever in the confines of an adaptation and still retain that character's personality or function.