Been waiting for the hallow seed and the portal gun in chest seed to be discovered to do this myself! This is the post is how I found out they finally have been found lol

Jason Todd was the partner to this world's Dick Grayson, before falling into a vat of chemicals similarly to the Joker, though suffering burns and disfigurement. Believing Dick had abandoned him to die, Jason stalks the night as the Red Hood/Phantasm, stealing Dick's old Red X costume.