Monster King Solomon III aka Solo


 * Voiced by: Tomo Saeki (Japanese), Johnny Yong Bosch (English)
 * The current Monster King, he is a former Melos warrior. After defeating the previous Monster King, the Melody of Oblivion told him that the monsters would attack the humans indiscriminately. And if every monster were to be defeated, then humans would turn into monsters. The only way to prevent it would be for Solo to take up the role of Monster King himself. He pleads with Bocca to join him as his equal, to help relieve the extreme loneliness of his position. Solomon goes so far as to offer Bocca half of the world to control if he would only join him. He keeps the Melody of Oblivion in chains at his palace on the Island of Monsters. Solo is also riddled with guilt over what he has done to protect people. He has the ability to instantly hypnotise humans and control them into doing what every Solo desires. He uses this ability to kill the Prime Minister of Japan.