Casey Jones (Duo-Franchise)

Casey Jones is a recurring character/brief main character/recurring antagonist of the Duo-Franchise and the quaternary villain of the Duo-Franchise arc The End Part 1. After getting infected by the head parasite of a poisonous fog, he became Lich King, the "ultimate parasite". Thankfully, he is pacified and eventually has the parasite's side effects combine with his snake attributes to become an unofficial Myles Bot known as Greenvenom. After his ascending to main character status was scrapped, his status with the protagonists was unknown up until he resurfaces and reveals his true nature to the world. Luckily, Aiden and Luke defeat him by beheading the treacherous teenager.