Ernesti Echevalier, often referred to as Eru, is the protagonist of the anime series Knight's & Magic. Originally a talented programmer and mecha enthusiast from modern Earth, he is reincarnated into a world where magic and giant robots, known as Silhouette Knights, exist. Eru possesses a keen intellect and unmatched passion for creating and piloting these mechanical giants. His innovative designs and strategic thinking quickly make him a pivotal figure in the kingdom's defense. Eru's character is marked by his unyielding determination and childlike enthusiasm for mechas, driving the series' narrative forward.