Do sprites like Fefeta and Arquius, where the sprite was made from somebody who was dead (and presumably was a ghost) leave ghosts when they die? If they do, do they leave Fefeta-type ghosts or two separate ghosts? And, since they were made from dead people with ghosts, do those ghosts vanish when the sprite is made? I bring it up because of the Equius and Nepeta ghosts in the flash. It feels so tragic to think Nepeta or Equius would poof away from that.

Double sprites like that suck the ghosts from the furthest ring into the sprite and when it exploded the individual ghosts return to the dreambubbles. This is seen when Sollux says his half ghost was pulled from him when Erisol was formed and when Nepeta and Feferi returned to the dreambubbles when Fefeta sprite-sploded.