ATTENTION!!! This is the sequel to "The Angel of Monsters", and I suggest you read that first before you read this, or some things might be confusing.
Echo is a hybrid. She wasn't born the usual way, in fact, she wasn't really born. Both of her parents had died at some point, and their magic fused together and made a soul. She wasn't able to talk at first, but she eventually learned and started going to a human school. She was bullied for being half monster, so she was transferred to a monster school, where her friends, AJ, Goth, and her cousin Virey go to school. There, she meets Impact for the second time, who is the child of Mettaton and Papyrus. She and Impact become good friends, and eventually something more.
(I'M STILL INSANE!!! I SHIP IT THOUGH!!!!)