when did that happen? I always thought he was white. Candace is really pretty. Having said that I really prefer having my favorite characters not being racebent. Heimdal? no issue. Someone like Spidey or Daredevil or Batman? no I don't want to see that. same goes for female Doom. That is a terrible idea.
Spidey is "a poor kid that's smart/ really nerdy and from NY". Given the ethnic set up of his area he could be Asian or Black or Mexican or w/e and nothing would change. He could also be a female seeing as his back story is very much gender neutral.
DD ... IDK much about his origins other than the movie (Dad was a good local boxer who was dirty and took dives for cash or something). not sure ... but being a white boy may be deep rooted in this origins.
Bats though, he has a "reason" to be white. It's a bit shaky but yeah, he comes from "Old Money" in the US ... which means he would likely be White. Nothing gender biased about that though so he could be female and nothing would change.
Supes is only "White" by default or to fit in with the Kents ... who could be some other race I suppose. But given his location I could give that a pass (I mean, if pretty much everyone but the Kents are white then that makes Clark stand out even more when they notice that Supes is Mexican and shows up in their town a lot right?). No real reason in his origin for him being a man though.
Cap America ... yeah, he has to be a pretty white MAN given his origins. The US wouldn't have anything else rep them or hold that title at that time ... no women and no PoC. So yeah, there couldn't be an Asian Cap America or a Lady Cap.
The FF ... THIS is interesting! The reason I think this is fluid is because they don't have to worry about having a secret ID, everyone knows who they are. So sure, why not change it up?
On the flip side ...
WW ... has to be a Amazon woman. What ethnic group "Amazon Women" are could be w/e IMO. In her movies they show to have many different ethnic groups that live there so I think that's fluid but she gotta be a lady.
Storm ... being a "African Goddess" is a really be part of her origin.
With Women and PoC many times their origins heavily rely on them being a PoC or a Woman. As if they have to have an excuse for them not being white.