Once I activate this device, the unitig of both worlds will begin! I created this world to be the ultimate RPG! Heroes, I shall anticipate the day we truly meet!
~ Gemumu, during the 2010 PV of the Keroro RPG game.
Devil King Gemumu (魔王ゲムム Maō Gemumu), real name Agon (アゴン Agon) is the main antagonist and final boss of the DS game Keroro RPG: Kishi to Musha to Densetsu no Kaizoku. He is the Dark Lord of the gameworld and has been waiting on Pekopon/Pokopen (Earth) for many years.


Gemumu is a dark teal Keronian with glowing light blue markings and light red/pink eyes. He wears a purple helmet with long gold horns and wears a long black cape with a blue diamond in the middle. His symbol is is the Special Flag symbol found in several Namco games.


Gemumu is a power-hungry and cunning tyrant of the gameworld who hates the Keroro Platoon with a burning passion.