Hajime Aikawa is the human form of Kamen Rider Chalice in the Japanese tokusatsu series 'Kamen Rider Blade.' He is a mysterious, reserved individual with a tragic past, serving as both an ally and a rival to the other Riders. As the Joker Undead, his existence is central to the fate of humanity, and his internal struggle with his identity forms a key part of the series' narrative. Hajime's complex personality and role drive much of the show's emotional and philosophical depth.