First Fallen Human

Meet the First Fallen Human. Chara. They's genocidal and once friends with Asriel. But.. Chara died after they told Asriel to posion themselves, so all the monsters could be freed from Underground and kill 6 more SOULs. The plan didn't succeed, after Asriel decides to bury Chara's body with their SOUL. Long after, Asriel died and turns into Flowey after Dr. Alphys mixed his dead SOUL with a plant. Back to Chara, they're once the Royal Guards captain, and possess the magic of 'Demon'. Chara owns the items of Real Knife and heart necklace. She is dangerous toward another, and hides behind the innocent smile of kindness. Their full name is Chara Dreemur, after adopted by Toriel and Asgore, the former king and queen of Underground. Hundred of years later, you, the Ninth Soul has entered the Underground after fallen down Mt.Ebott's hole. You were walking after months surviving, in the Snowdin's Forest, when a encounter happens.