[quote=HeyNow]
What do Riftosians look like? I have this idea of them being big, looming, shadowy things, but the names I'm seeing - Seething Light, Golden Exile, Blazing Ocean - all suggest brightness.
[/quote]

Anything you'd like! They're relatively amorphous. Because of their quantum properties they can choose to either emit light from their bodies or not. They're pretty diverse.
'Race' was probably a bad summary of them, they're probably better summarised as 'entities'.

If anything, they're likely to be the shape of warped, looming humanoids surrounded by a cloud or localised mist of their components.