Fist of the Blue Sky

Souten no Ken
蒼天の拳

Sequel

Fist of the North Star
Hokuto no Ken· 北斗の拳
manga

One day, a wanderer appears out of the wasteland to bring justice to the guilty and hope to the people—a warrior named Ken, a man who bears seven scars upon his chest and holds the secret of a mysterious martial art known as Hokuto Shinken, the Divine Fist of the North Star! (Source: VIZ Media)

Sequel

Fist of the North Star: The Silver Saint - Toki's Story
Hokuto no Ken: Toki Gaiden· 銀の聖者 北斗の拳 トキ外伝
manga

Toki is a former Hokuto practitioner, and his incredible strength coped with his knowledge of the assassin art would be enough to call him devil.... But Toki's kindness and desire to help people prevent them from calling him devil, they instead can only whisper words akin to that of 'savior'.

Sequel

Fist of the Blue Sky: Regenesis
Souten no Ken: Regenesis· 蒼天の拳 リジェネシス
manga

Long before Kenshiro said, "You're already dead," a different Kenshiro walked the violent streets of Shanghai. The city is in constant crisis as two mafia families battle one another for supremacy. In the crossfire, a little girl named Erika is orphaned and soon taken under the wing of martial artist Liu Fei-Yan. Sorrow seems to follow the girl, as every time Fei-Yan attempts to hand her off, her new guardians end up dead. Fei-Yan decides to bring the girl to a man named Guise but instead crosses paths with powerful Kenshiro Kasumi.