"....the flair and attack they showed in dispatching joint-favourites Nigeria impressed all who witnessed it."
-- Ludo Bagman reporting in the Daily Prophet, 2 July 2014 (Pm)
Quidditch player, Chaser for Japan’s National Team (2014).
Yamaguchi was one of the three Chasers in the talented Japanese team at the 2014 Quidditch World Cup tournament (Pm).
His team won their matches against Poland and Nigeria, but then lost to Bulgaria at the semi-final stage. Japan won against the United States to secure a third place overall (Pm).
Other canon notes and references
Since Viktor Krum, born 1976, was the oldest player at the tournament (Pm), Yamaguchi must have been born after 1976.
As he or she comes from Japan, Yamaguchi will have attended the Mahoutokoro Wizarding School, as all the members of the Japanese national side are said to have done so (Pm).
Dates born after 1976
Species / Race Wizard
Profession Quidditch player (Chaser)
Ryuichi derives from 竜, 龍 (ryuu) meaning "dragon" and 一 (ichi) meaning "one". He may also be named after the award winning Japanese musician and composer Ryuichi Sakamoto.
Yamaguchi derives from Japanese 山 (yama) meaning "mountain" and 口 (kuchi) meaning "mouth, entrance" (Behind the Name).