|First appearance||Keroro RPG: Kishi to Musha to Densetsu no Kaizoku|
|Voiced by||Ryōtarō Okiayu (Japanese)|
|Aliases||Devil King Gemumu|
|Species / Type||Keronian|
Gemumu is a dark teal Keronian with glowing light blue markings. He wears a purple helmet with long gold horns and wears a long black cape. His insignia is is the Special Flag symbol found in several Namco games
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