Why are Seons stuck as floating balls of light in the Cognitive Realm, while true spren get to be people shaped? I feel that is unfair.
That is a little unfair isn't it. Boy, Sel has all sorts of unfair things going on. But they can leave Sel, so there's some sort of clue there. But lots of unfairness to everybody from Sel in various ways. But the thing that is not unfair is: they're able to get places.
Just gotta escape the deadly plasma, you know. No big deal.
If they can escape the deadly Investiture plasma covering the Cognitive Realm... not even covering, like... suffusing the Cognitive Realm where they are, the Expanse of Densities. If they can escape that they can go places.
I'll be honest. I couldn't decided if I should use a seon there at the end or a Tamu Kek. In one draft it was a Tamu Kek, and then I thought, "Eh, seons are way more interesting because they have volition. Tamu Kek is just a bone." It was a Tamu Kek originally, and then it was a seon, then back to a Tamu Kek, and then I released it as a seon.