She already retconned him into a Creole, even though he was originally a white dude, the reason nearly every fan depiction of Human Alastor looks the exact same is because she saw a piece of fanart and confirmed that's more or less how she pictured him, they even used a different piece of fanart (I still can't believe they actually fucking used fanart for audition sheets, no wonder everyone thought it was a bunch of bullshit) depicting him as such.
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Of course, I'm certain that Viv didn't make this retcon to be more accurate/inclusive or some shit, she almost certainly did it so she could make the poor little cannibalistic serial killer a victim of racism and reveal he only killed racists so he's not
actually that bad of a guy, just ignore the fact that Creole people were by and large treated equally to whites in New Orleans during the early 20th century.