And while Walhart is an antagonist, he's a markedly less villainous one than the Grimleal.
Walhart is pale gray, not dark skinned.
And I do have a problem with the narrative being "all like Walhart just wanted to kill all Grimleal, he's not a bad guy, its the fault of the Grimleal that Chrom fought him."
Again with the inspiration for the Grimleal, the main characters of the 90s game explicitly rule out trying to wipe them out as just continuing the cycle of hatred.
(In response to this post)
First off, Walhart compared to Chrom.
Walhart isn't "black," but he's certainly not white(ish) like most of the heroes.
More importantly: You might have noticed that what I said about Walhart was not in fact the end of that post. I spent a paragraph and a half describing how various darker-skinned characters in the game are Less Bad than the Grimleal, before spending two and a half paragraphs criticizing those characters from a racial angle.
My conclusion was not that FEA is non-racist, but that “its racism is more nuanced than 'Grimleal bad'”. Some of the non-whtie(ish) characters are racist because they're obvious villains, but others are racist because of their heroic qualities, etc etc.
Starting with the less overtly racist elements was a rhetorical technique I call "steelmanning". It's the opposite of a strawman argument, where you create an intentionally weak version of an argument you disagree with, to make it really easy to argue against. A steelman arguments starts by briefly outlining the strongest possible version of the argument you disagree with, so you can show that even that version is flawed.
I focused on characters other than the Plegians because to be blunt, your ask covered them well enough. But talking about Fire Emblem Awakening's racism/colorism as though Plegian villains were the only characters with a skin tone darker than an Aryan shut-in is incomplete.