>>17567721I'd recommend watching all of his works as he has done all kinds of genres, even anime. But these are generally considered his best kinos, especially the ones from 1999 to 2003.
Shinjuku Triad Society (1995)
Osaka Tough Guys (1995)
Audition (1999)
Dead or Alive (1999)
Ichi the Killer (2001)
Visitor Q (2001)
The Happiness of the Katakuris (2001)
Graveyard of Honor (2002)
Gozu (2003)
Yakuza Demon (2003)
Imprint (2006)
13 Assassins (2010)
Harakiri (2011)
Lesson of the Evil (2013)
Yakuza Apocalypse (2015)
First Love (2019)