Akira Nishitani (西谷 亮, Nishitani Akira), also known as "Nin-Nin" or simply "Pom G", is a Japanese game director, game designer and character designer. Nishitani started working for Capcom in 1986, where he became mostly known for designing Street Fighter II and Final Fight alongside Akira Yasuda, aka Akiman. In 1995, he left Capcom to found his own company, Arika, whose first works were on the Street Fighter EX series that they developed for Capcom.
Source: “Akira Nishitani”, English Wikipedia (CC BY-SA 4.0), excerpt