You know what's a really interesting thing to explore for Solatorobo?
According to Ragdoll Elegy, Nero and Blanck already exist at the time of the destruction of Ragdoll at the absolute earliest, which normally wouldn't make sense with what we know about the pair being created by Merveille and Baion about a decade before the events of the game.
What this implies, however, is that there were two Hybrids from the pre-Reset era that were intended to control them, and Baion straight up just couldn't find them. This would mean that they're still out there somewhere in cryostasis much like Baion was.
It'd be really fun to explore this concept and have them wake up post Solatorobo and find out about everything that happened, including the fact that they have replacements. Even better if we ignore the canon "Yurlungur made them new bodies but they're literal babies with no memories of anything and somehow Red and Elh get stuck raising them" and go with the more popular "Merveille just made them new bodies and transferred their consciousnesses in from where they were backed up in the Dahak".