Castor is a star. Specifically gemini. He and his twin sister, Pollux, complete the Gemini Twins. He loves reading. He isn’t very social. He’s rather calm and collected. He’s pansexual, and will always support anybody. He’s almost always holding a book. If he’s surprised, he’ll end up tossing his book in surprise but he’ll catch it. He’ll drop his book the second he hears something that makes him angry. He’ll put his book away when he’s serious about something (my version/AU)