Galactic Nova and Star Dream technically act as guardians to Stella, since the rest of her family are unknown and nobody really knows where she came from. (Also, yes I rewrote her story lol) Also, a headcanon I have is that Clockwork Stars like Nova and Star Dream can change their sizes at anytime whenever they enter different planets, and they are also able to sense when another Clockwork Star is dying or about to be destroyed, then they will come to help reboot and/or repair them.
