"evil black" (邪黒)
Prince Demande (assumed)
To invade Chibiusa's dreams
Jakoku entered into Chibiusa's dream to keep her asleep until the Black Moon Clan could capture her. Sailor Pluto contacted the Sailor Senshi from the future through the Luna-P and transported them into Chibiusa's dream world where the Sailor Senshi fought Jakoku. None of the Sailor Senshi could even damage Jakoku, until Sailor Moon, after saving Chibiusa from falling to her death, attacked Jakoku with her Cutie Moon Rod, and then destroyed him with Moon Princess Halation.
- Jakoku attacks Chibiusa inside the dream world. This is similar to an iconic horror movie villain, Freddy Krueger in A Nightmare on Elm Street.
- Jakoku is obviously based on the Grim Reaper.
- Jakoku appeared twice in the "Bishoujo Senshi Sailor Moon: Another Story" video game. He was first seen as a boss at the end of the Juuban Junior High School Level. There were also some ordinary enemies resembling Jakoku, except that they are brown in color.
- Jakoku is a Droid that has the closest resemblance to the generic Droids from the manga.
- Jakoku is also very similar in appearance to the Wiseman. Both are hooded evil figures with hidden faces and they even sound slightly similar when they speak.
- The original dub translated his name as "The Grim Man"