[An au where Leo goes missing before the events of the show and is replaced by an unknown youkai that is exactly identical to Leo. Will the brothers find out that the brother they're living with is not the one they grew up with? We'll see.] The characters that are mentioned in this book is from the show named, 'Rise of the Teenage Mutant Ninja Turtles' and could be watched on either Netflix or Paramount +. The only character in this book that isn't from the show, is the unknown youkai that is actually an oc I made. I hope you like my first ROTTMNT au book!