Answer
Rikiya played the role of Kamen Rider Skull, a mysterious Kamen Rider who debuted in the 2008 series "Kamen Rider Kiva". He is known for his unique transformation device, the "Skull Survive", and his signature weapon, the "Dark Saber". Rikiya's character undergoes a captivating journey as he fights to protect his loved ones and confront his past, making him a fan-favorite among the "Kamen Rider" fandom.