Some heroes from the US south or midwest who aren't kinda mean pokes at hardline conservatives (like US Agent) would be a fun twist. There are lots of genuinely nice folk who happen to have been born south and west of NYC with their own culture that feels a bit marginalized, or even flanderized, when they do appear.
I do laugh at the term 'oversaturation' since there's also complaints about the saturation levels in the Marvel movies, and that's all about *the color*, not the number of people. Cause, at one level, this discussion is also about 'the color.'
All them new colors showing up to darken up the old familiar sea of white faces.