Menthuthuyoupi, often referred to as Youpi, is one of the Royal Guards serving directly under King Meruem in the anime and manga series Hunter x Hunter. As a Chimera Ant, he possesses immense strength, endurance, and the unique ability to alter his body at will. Youpi is loyal, fiercely protective of the king, and initially displays a simple-minded, battle-hungry nature, but gradually evolves to show deeper emotion and respect for his enemies. He plays a major role in the Chimera Ant arc, acting as one of the main antagonists.