Mephisto is a complex antagonist in the mobile game Arknights, known for his enigmatic personality and his manipulation of the Infected. As a member of Reunion, he serves as a commander who wields the power to control devastating Originium creatures. Mephisto's unsettling charisma and loyalty to his fellow Reunion leaders make him a formidable opponent. His past is shrouded in mystery, adding layers to his motivations and actions within the series. Despite his antagonistic role, Mephisto's character explores themes of loyalty and the consequences of societal ostracization.