Kagerō Usui holds the position of class president for Class 2-He yet exists in a state of near-invisibility, consistently overlooked by classmates and staff. His name, derived from the Japanese phrase *kage ga usui* (影が薄い), meaning "overshadowed" or "lacking presence," directly mirrors his condition. The term *usui* (薄い) additionally references his thinning hairline or bald spot, a defining physical trait. His invisibility is not permanent; it temporarily pierces when wind or accidental actions expose his concealed bald spot. These fleeting moments of noticeability often coincide with his attempts to interact, particularly with female classmates, before he inevitably fades back into obscurity. He harbors a crush on Abiru Kobushi and frequently leers at other female students, especially Kaere Kimura, though his advances pass unseen due to his imperceptibility. His role as class president is nominal, his authority ignored, and his efforts to fulfill duties thwarted by his lack of presence. Across all series, films, OVAs, and related media, he exhibits no significant character development, background story, or evolution. His narrative function remains confined to recurring gags about his fluctuating visibility and unrequited interests. His birthday is August 7.