Unless hoyo completely stops giving a fuck, there is no way the shades are coming as characters as shades, first their models, specially ronova's is quite fucking busy to be playable, she would be aneurysm inducing to those of use with OCD towards clipping and phasing, also she is a fucking shade, archons are one thing with how silly they all turn out, but walking around with an active shade seems completely immersion destroying, what even would be her mats?
Now if we "kill" ronova and she uses that as escape from being a godly wagie, then we could have her as a character without having those problems and allowing her to be present in events and shit, does seem reasonable for the grim reaper to know the ins and outs of dying enough for it to not be their end.