Sans is the King of the monster kind and his brother papyrus was the prince until he ran to the ruins when sans proposed killing humans to break the barrier Their dad Gaster was very smart until he died to a experiment and their mom Arial also died during the war. Toriel is the captain of the Royal gaurd and her son Asriel is trying to get in Chara is Sans judge Aria can teleport, use bones, gaster blasters, and swords like sans, she can use wildlife around her Sans and Aria left eye glows blue