https://anilist.co/anime/967/Fist-of-the-North-Star/
Prequel:
https://anilist.co/anime/1541/Fist-of-the-Blue-Sky/
Sequel:
https://anilist.co/anime/1356/Fist-of-the-North-Star-2/
https://anilist.co/anime/114099/Dragon-Quest-The-Adventur…
https://anilist.co/anime/2402/Tomorrows-Joe/
https://anilist.co/anime/2921/Tomorrows-Joe-2/
These two have a bunch of movies and OVAs:
https://anilist.co/anime/149939/Ranma-1989/
https://anilist.co/anime/1293/Urusei-Yatsura/
This one has multiple seasons and recently had a crossover with Baki so you might like it:
https://anilist.co/anime/100891/KENGAN-ASHURA-Part-I/
This has multiple seasons and specials:
https://anilist.co/anime/355/Shakugan-no-Shana/
Fate series has a bunch of seasons, specials, movies, and spin offs:
https://anilist.co/anime/356/Fatestay-night/
Macross is a huge franchise as well:
https://anilist.co/anime/1088/Macross
Guide: https://anilist.co/forum/thread/77128
Gundam is another massive franchise. If you tried to watch everything… that will definitely keep you busy for quite a while. This doesn’t even cover half the entries but it’s a decent guide for newcomers: https://anilist.co/forum/thread/56643