An older child, nearly five, abducted with Mei and glimpsed in the hidden Ganymede facility.
Sandro Ventisiete is one of the missing Ganymede children whose parents share Prax's grief. Almost five, he is one of the "big boys" Mei recognized and waved to inside the hidden surface facility during her abduction — his presence briefly reassured her. His name later appears on the list of vanished children (Mei, Katoa, Gabby Solyuz, Sandro) that Prax comes to understand.
A boy of almost five; no detailed physical description is given.
One of the abducted Ganymede children, seen by Mei in captivity.