Watari starred in two of Kinji Fukasaku's best yakuza films, Graveyard of Honor (1975) and Yakuza Graveyard (1976):
Both of those films are incredible and absolutely worth seeking out, along with any of Watari's other yakuza roles, such as Tokyo Drifter and Outlaw Gangster VIP. All four of the titles I named have had English friendly releases, with Arrow due to release a new Blu-ray edition of Graveyard of Honor (along with the amazing Takahashi Miike remake) any day now.
Then, heading to the other side of the law, Watari played a two-fisted, tough as nails cop on the
Seibu Keisatsu series from 1979-1984:
And, if that wasn't enough, here's Watari delivering the heartfelt ballad
"Kuchinashi no Hana":
Farewell to an absolute legend.