|Alignment:||Black Moon Clan|
|Associates:||Black Moon Clan|
|First Anime Appearance:||A Mysterious New Senshi, Sailor Pluto Appears|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
|English Name:||The Grim Man (DiC dub), none (Viz dub)|
|Actors:||Hisao Egawa (anime), Tony Daniels (dub)|
Jakoku was a Droid belonging to the Black Moon Clan which appeared in episode 75. He had chalk-white skin with only his arms and part of his face showing, as most of his form was covered with a dark, flowing robe. He carried a scythe which he employed as weapon against the Sailor Senshi.
Jakoku first appeared and attacked Chibiusa in her mind, trapping her in a nightmare. After Sailor Pluto helped the Sailor Senshi enter the child's mind to assist her, Chibiusa did not recognize them and ran away, at which point the Droid showed himself. When the Senshi transformed and engaged him, they found their attacks were simply deflected, and the Droid easily disabled them. Only after Chibiusa asked for Sailor Moon's help was she able to repel his attack, and she finally destroyed him with Moon Princess Halation.
- His appearance is based on the Grim Reaper, a personification of death.
- His name literally means "evil black" (邪黒).
- In the video game Sailor Moon: Another Story, Jakoku appeared as a boss at the end of Chapter 1, in Juuban Junior High School, and brown versions of him appeared in the underground temple area during Sailor Jupiter's story in Chapter 2. In addition, some of the ordinary enemies in the game bore a strong resemblance to Jakoku, even though they were not intended to be him.