You can use MAL to search for an anime or manga. It also lists prequels, sequels, specials, alternative versions, and what it's adapted from (like a manga). This is a search for it's Japanese name https://myanimelist.net/search/all?q=Hokuto%20no%20Ken&cat=all. You can search the English also https://myanimelist.net/search/all?q=Fist%20of%20the%20North%20Star&cat=all

There's a 1984 TV show (with over 100 episodes), some 1980s movies, and some 2000s anime.

In additional to the games mentioned in a different reply, you might want to look at God Hand (PS2). It's not a Fist of the North Star game, but people who like the series might enjoy it as well.

You can use MAL to search for an anime or manga. It also lists prequels, sequels, specials, alternative versions, and what it's adapted from (like a manga). This is a search for it's Japanese name https://myanimelist.net/search/all?q=Hokuto%20no%20Ken&cat=all. You can search the English also https://myanimelist.net/search/all?q=Fist%20of%20the%20North%20Star&cat=all

There's a 1984 TV show, some 1980s movies, and some 2000s anime.

In additional to the games mentioned in a different reply, you might want to look at God Hand (PS2). It's not a Fist of the North Star game, but people who like the series might enjoy it as well.