Because race has been a very important issue in the fandom for the last few days:
When somebody misrepresents a character, and they haven’t been called out on it before, do not be rude to them! They probably don’t know how their misrepresentation is offensive or harmful, and because of that, we should explain it to them as kindly as possible.
I’m not talking sending them “Ummmm, Cinder’s not white?? Wtf?! That’s really offensive….” No. That’s not the right way to go about it. A good way to let someone know that they’re doing the wrong thing is to send them an ask saying “Hey, I really like your art/fancasts! However, I don’t know if you know this, but Cinder is actually confirmed to be mixed race, most likely Asian! Portraying her as white is actually harmful due to the underrepresentation of POC in the media. It’s called whitewashing, and it’s a big issue. I understand if you didn’t know, but yeah, this is a thing.” That’s a bit long, but I think it’s polite and calm enough to get through to the person.
Side notes: Making a post about misrepresentation in the fandom is not calling a person out. Just because posts have been made about the subject doesn’t mean the person knows about them! Always be kind! Also, any of this could go for other issues, such as Winter’s mental health, her race, or any of the other characters! I just chose to use Cinder and her race as an example because she’s the main character.