(Cosmic disclaimer: Differences in characterization are unavoidable in fanfiction. If anything is seriously wrong, please let me know so other readers aren't affected. The characters belong to miHoYo; any out-of-character writing is on me. Please point out any plot holes that contradict the original, and I'll revise or remove them.)
(Top, two male leads, Trailblazer Stelle)
Carlos can't figure out why his brother has been acting strange lately. Every day, he wakes up from a nightmare and starts repenting.
Zandar: “My absurd creation is mine to deal with, as its creator.”
Then he dies. Carlos is glad that the wreath he's kept hidden for so long finally comes in handy.
After that, Carlos sets off to explore the sea of stars. Along the way, he meets countless companions: pranksters, street-racing delinquents, bugs, and more. Then he realizes: Why am I surrounded by Aeons?!
Carlos: “By all rights, does that mean I'm about to become an Aeon too?”
Nous: “That's right, that's right! Come merge with me, little brother!”
Zandar: “(An eloquent string of cosmic swearing) It's bad enough that my rebellious son is causing trouble, but now he wants to drag his uncle into it too!”
Carlos: “This doesn't seem right. I demand to inspect the cards!”
Nous: “The cards are fine. Merging with an Aeon counts as becoming one, doesn't it?”
He runs, Nous pursues, and he has nowhere to fly. But now there's one more person in the universe who wants Nous dead.