Hell yeah, it's about time for a 'manime' thread. I loved Hokuto no Ken when I first watched as a teen 15 years ago. Of course I saw the blatant Mad Max ripoff from Ken's outfit, but I'm glad I overlooked it. The music is awesome, the story is over the top and has a lot of 80s cheese, but in the best way possible.
Another favorite manime of my is the 1988 anime Sakigake!! Otokojuku. It's about a bunch of delinquents that get sent to a correctional school where they face a bunch of challenges from rival cliques to a variety of other things. I absolutely love the intro theme but the outro's visuals and music are my all time favorite, I love listening to it on a warm summer night.
Intro theme
https://youtu.be/S6Xn3q5mjAUOutro theme
https://youtu.be/eIzRA7P86CAAnother lesser known one that I can think of is Salaryman Kintaro which is about just that. A really manly single dad who has a young son but it used to fighting tries to make it in the white collar world.