WHAT DO I PICK? I know you will tell me to C6 Jean and Kekqueen, but for once we can pick up a constellation from a limited C6 character... Though I can't say Nilou's C1 or Ayaka's C1 seem worth it. Didn't check Kokomi's, I doubt it's worth it, and Eula is just there to sit the bench since she has been released.
Maybe I could salvage Dehya with her C2? Could be useful in Theater as she's somehow always part of the available characters.