|Alignment:||Black Moon Clan|
|Occupation:||Posed as a participant in Protect Esthe|
|First Anime Appearance:||Women Should Be Strong and Beautiful! Rei's New Killer Move|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
|English Name:||Rhonda (DiC dub), Dumbull (Viz dub)|
|Actors:||Hiroko Emori (anime), Lisa Dalbello (DiC dub)|
Dumble was a Droid belonging to Koan which appeared in episode 63. After Koan found out the Hikawa Shrine was a Crystal Point, she and Dumble disguised themselves as participants in Protect Esthe and flooded the shrine with Dark Power. The disguised Dumble began to attack the others at the class, and as the Dark Power spread the participants also began to fight amongst each other. Rei sensed something was amiss and protected her grandfather from the Droid when Dumble dropped her disguise, and was saved by Sailor Moon's arrival. With the help of Tuxedo Mask, Sailor Moon destroyed Dumble with Moon Princess Halation.
Dumble possessed great strength and fighting skills, and could also generate electric energy waves that immobilized her targets. She also performed a joint attack with Koan called Koan Dark Power Flip.
- Her name could be a play on the word "dumbbell," which can mean either a stupid person or a small weight.
- Dumble could only repeat her own name in the original version, but in the first English dub she was capable of speech.
- Dumble's appearance could have been inspired by Japanese pro wrestlers Bull Nakano and Dump Matsumoto, who often wore facepaint and styled their hair to stick straight up.
- Dumble was one of the monster types that appeared in the video game Sailor Moon: Another Story. Many Dumbles could be encountered in Canada, in the top parts of a large tree in the Medias village.