Toranosuke Takagi
Italian driver Ronnie Quintarelli won the most drivers championship titles with four. Quintarelli also holds the record for the most drivers championship title won by a non-Japanese driver and the most drivers championship won in GT500 class with four. Tatsuya Kataoka and Nobuteru Taniguchi were tied for the record of most drivers championship won in GT300 class with three. Tetsuya Yamano was the first driver to win multiple championship as well as the sport's first two-time champion, all of them won consecutively. Three drivers, Toranosuke Takagi in 2005, Jenson Button in 2018, and Nirei Fukuzumi in 2019 have managed to win the championship in their first full-season attempt. As of the end of the 2019 season, Masataka Yanagida and Kazuya Oshima are the only drivers in the series history to have won the drivers championship title in both classes.