Castor and Pollux are brother and sister, both aren't human, they are stars, both have star powers, Castor can speak to be telepathically, and Pollux and do weather things, Lunar was dead and rebuilt in space that's how he gained star powers, Castor and Pollux's job is to make sure Lunar's powers are under control so the other astro bodys don't kill Lunar, Castor is more monotone and calm, Pollux is more happy and energetic, they both can teleport, Lunar is animatronic, Pollux and Castor aren't