There are black characters in the Thor movies. I didn’t know that there were black Norse gods.
They may be fictional characters but it is still racist to shoehorn in black casting where it was never written that way.
Sgt. Fury/Nick Fury, Little Orphan Annie, etc etc.
Maybe the next Shaft film could star a Chinaman.
I wanna see Jesus and the Apostles as Chinamen!
There would be nothing wrong with making Shaft Asian, and it wouldn't be racist to do so.
You don't seem to understand what racism is. It has nothing to do with changing the race of fictional characters for whatever reason.