Theodoros Ryuki Kamekura Panagopoulos (), known as Theo Ryuki or Theo Japa (born 31 July 1995) is a Japanese-Greek former professional footballer. He also holds Brazilian citizenship.
He made his professional debut in the Segunda Liga for Portimonense on 11 December 2013 in a game against Chaves.
He left the club after the 2018âÂÂ19 season and subsequently retired from football, instead pursuing a career as a sports agent. He has since represented players such as Shoya Nakajima. In May 2021, he was mentioned as a suspect surrounding the falsification of a COVID-19 test of Nakajima.