The Shadow Conductor

His bio is long so I won't put it here, you can read it here if you want: https://www.deviantart.com/sneakysneasel/art/The-Shadow-Conductor-732888780

TL;DR He is a Lunarian from the planet Eclipsia who went insane after his family and most of Moonvale was wiped out by a natural disaster, causing him to become murderous and strike a deal with a djinn to gain deadly powers. He runs a murderous circus with the intent of killing Solarians. His real name is James Moonweld.