Also descriptions for her features, traits, and spells

probably is still just a sinner but maybe she has deals with things greater than sinners like goetia or even Roo

I really don't think it has been proven. The basic cannibals had red blood and also didn't seem to trigger the deal heaven had with Lucifer being broken. It's possible Rosie is Hellborn but then she would have to be like a goetia to be as strong as she is and she doesn't look like one. So she

Is anymore. The fact that he is not that much younger than Alastor but has completely embraced modern fashion and technology is an interesting point of contrast in the core cast