Echo is pretty much a minion to Salem. He's devoted his life to assisting Salem with all of his evil schemes and plans after Salem hesitantly saved him ages ago. He is rather irritating and has a tendency to talk a lot. He often refers to Salem as his "master" and he does anything that Salem asks him to do. He is a small fairy with black skin, dark blue eyes, and bat-like wings that allow him to fly. I imagine him as sounding like Plagg from "Miraculous: Tales Of Ladybug & Cat Noir". If you don't know what show that is or what character he is or how he sounds, you can watch this clip here: https://www.youtube.com/watch?v=iT3rlEOoIRc