Heh, heh. Stupid humans. For as long as you creatures have roamed this world, I have been here to feed on your hatred and jealousy. It is why I am fear incarnate. And you wish to stop me? I'd love to see you try.
~ Biomeka

Biomeka is the main antagonist and final boss from Monster World III/Wonder Boy in Monster World and Monster World IV.

Monster World III/Wonder Boy in Monster World

Seeking to take over Monster World, Biomeka sends an horde of monsters who plague the kingdom of Purapril and brainwashes the Dark Prince, who is turned into a monster. The hero Shion sets on a journey to save Monster World, fighting the monsters and saving the Dark Prince, who tells Shion about Biomeka. Shion travels to Biomeka's spaceship and fights him, but ends defeated, so the Dark Prince uses his power to break Biomeka's defenses, allowing Shion to fight the monster, who ends defeated. Though Monster World is saved, Biomeka escapes.

Monster World IV

Biomeka hides himself beneath the kingdom of Rapadagna, where he starts feeding on people's dark thoughts. He sends the Four Warlocks, who give Pepelogoos to the inhabitants of Rapadagna, which are actually dark Pepelogoos that drains people of their hopes. The heroine Asha fights the warlocks, but their influence causes the Queen of Rapadagna to go mad and turn evil. The Queen attacks Asha, but Pepe, her Pepelogoo, blocks an attack from the Queen's dark Pepelogoo and is knocked unconscious. After the warlocks are defeated, Asha fights the Queen again but Pepe, now recovered and fully grown, interrupts the fight and starts singing, making the Queen to recover her senses and all dark Pepelogoos to run away. Asha finds a hule in the castle, which leads to a underground cavern which she follows, finally finding Biomeka in the bottom. Asha fights the monster, who attempts to petrify her, but Pepe appears and blocks Biomeka's gaze, ending petrified himself. Asha finally defeats Biomeka and saves Monster World.