En Yufuin is a laid-back and carefree character from the anime series Binan Koukou Chikyuu Bouei-bu LOVE! He is a member of the Earth Defense Club at Binan High School, where he transforms into Battle Lover Sulfur. En is known for his relaxed demeanor and his love for the bathhouse, which he frequently visits with his friends. Despite his easygoing attitude, he is dependable in battles against the monsters that threaten the peace of the Earth, using his powers to protect those he cares about. His friendship with fellow club members is central to his character development throughout the series.