Yuigarde

Gholl's younger brother. He is highly ambitious and plots to replace the Demon King. He is not very intelligent and overestimates his own power, thinking only of brute force attacks during battles. As a result, he is often exasperated by the Four Heavenly Kings directly under Gholl. He mocks Gholl's actions of trying to make Flio his subordinate as "senile" and finally puts his plan to replace the Demon King into action, leading a rebellion. However, since Gholl voluntarily stepped down as Demon King, his efforts were in vain, and he smoothly became the Demon King. He then began an invasion of humanity, but the intelligence unit, which was supposed to be responsible for analyzing human forces, reconnaissance, and disarming traps, completely defected at the same time as Gholl/Gholl's resignation as Demon King. As a result, Yuigarde's invasion plan ended in a disastrous failure, causing significant damage and greatly lowering the morale of the entire Demon King's army.