They’re supa dupa strong in regard to the physical ability side, appearance wise is still the same.

Hair color, yes. Style really isn’t determined by genetics. There’s an edit of Nolan without a mustache though and he just looks like older Mark

He should, actually.

As we’ll see with >! all the bug hybrid kids the Viltrumites will have to breed a new army, they all gain normal Human/Viltrumite skin tones eventually post time skip in the epilogue instead of staying purple. !<

However, there’s no way they’d white wash Mark and remove his Asian features. That would probably start a controversy.