Hunter × Hunter: Phantom Rouge
"Hunter × Hunter" creator Yoshihiro Togashi wrote the two-part manga to act as a prequel to the film. A collected version of the story, referred to as "Volume 0" of the series, was given to the first million moviegoers. A light novel adaptation of the film was released by Shueisha on January 15, 2013.
Monster (manga)
In 2013, it was revealed that Guillermo del Toro and American premium television network HBO were collaborating on a pilot for a live-action TV series based on "Monster". Co-executive producer Stephen Thompson ("Doctor Who" and "Sherlock") was writing the pilot, while del Toro was to direct it and be an executive producer alongside Don Murphy and Susan Montford. In 2015, del Toro told Latino-Review that HBO had passed on the project and that they are in the process of pitching to other studios.