User blog comment:Musical of Corey/Character Ethnicities/@comment-4393544-20140909230346

Eva: Bosniak (or any Muslim ethnic group that lives in former Yugoslavia)

Sierra: Hispanic, though I would like her to be a former part of the German Empire (Namibian, Papua New Guinean, etc) just because one of her grandparents is German doesn't mean they lived in the motherland

Mike: Tanned/Hispanic (Vito) or half Indigenous Australian (Manitoba)

Max: North Korean (His pasty skin and hairstyle) or any part of East Asia

Dave: Hispanic (like his voice actor)

Sky: Cree (but she could be any Indigenous American ethnic group)

The BFFs: I heard that someone who works on the show said that both of them are Caucasian