| Theo Ryuki | |
| Fullname: | Theodoros Ryuki Kamekura Panagopoulos |
| Birth Date: | 31 July 1995 |
| Position: | Midfielder |
| Youthyears1: | 2012–2013 |
| Youthclubs1: | Porto |
| Years1: | 2013–2014 |
| Clubs1: | Porto |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 2013–2014 |
| Clubs2: | → Portimonense (loan) |
| Caps2: | 6 |
| Goals2: | 0 |
| Years3: | 2014–2019 |
| Caps3: | 64 |
| Goals3: | 2 |
| Totalcaps: | 70 |
| Totalgoals: | 0 |
Theodoros Ryuki Kamekura Panagopoulos (Greek, Modern (1453-);: Θεόδωρος Ριούκι Καμεκούρα Παναγόπουλος), 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.[1]
He left the club after the 2018–19 season and subsequently retired from football, instead pursuing a career as a sports agent.[2] 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.[3]