Yaiba Aoshima is a pseudonym used by the established Japanese voice actor Ken Narita for work in adult anime and games. Ken Narita, whose real name is Tsutomu Narita, is a freelance actor and narrator from Saitama Prefecture.

Under his real name, Ken Narita has built an extensive career in mainstream anime, known for a wide range of prominent roles. He is perhaps best known as the voice of Sesshomaru from the long-running series InuYasha, a role he has continued in the sequel series Yashahime: Princess Half-Demon. His other major mainstream roles include Jeremiah Gottwald in Code Geass, Jail Scaglietti in Magical Girl Lyrical Nanoha Strikers, and Durand in Le Chevalier D'Eon. He also succeeded the late Hirotaka Suzuoki as the voice of Bright Noa in the Mobile Suit Gundam franchise, starting with Mobile Suit Gundam Unicorn. His career has spanned decades, with roles in classic series like Hellsing, Monster, and Saiyuki, as well as newer hits like That Time I Got Reincarnated as a Slime and JoJo's Bizarre Adventure.

The alias Yaiba Aoshima is specifically credited for performances in adult content. For instance, in the 2004 series A Time to Screw, Aoshima is credited for the roles of Shijou Setsuya, Itsuya, and Jiya, among others. This use of a pseudonym allows the voice actor to separate his mainstream work, for which he is widely recognized, from his work in adult-oriented media.