Personally, I have to disagree.
Yes, Aurelion Sol deserves a new skin, but I don't want them to add him to the Starguardians.
The skin line is based on magical girl anime, like Sailor Moon or Puella Magi Madoka Magica.
But a gigantic dragon doesn't really fit in here, IMO...
At least I can't think of an example that this is a thing in these shows.
Starguardians are supposed to hide in human society, they go to school to hide their identity. Aurelion Sol can't do that, not humanoid enough.
And I don't want Aurelion Sol to be the first star (their leader).
When I read about the first star, I always imagined a caring mother figure, protecting the Starguardians.
These would be better candidates for that position, at least for me.
And last but not least: I don't think Aurelion Sol fits the aesthetic. I can't imagine him wearing that Starguardian outfit without looking like a bad joke.