Here's a list of series that I personally LOVE! Most of these are niche, so I will also provide resources for any curious monkeys who
Manga/anime series made by Asao Takamori and Tetsuya Chiba. Pretty much about a guy named Joe Yabuki who goes through some pretty rough stuff and eventually gets into boxing. I hear that Hajime no Ippo is inspired by this!
Small manga/anime series made by Kaoru Shintani. Basically about a now graduated pilot, Shin Kazama, hoping to work at his dream at Yamato Airlines but get tricked into signing a contract. It's definitely a good series and an aircraft enthusiast's dream!
Manga/anime series made famous by Shigeru Mizuki. It tells of yhe many yokai related ventures of Kitarou and his smol eyball dad, Medama-oyaji. (and all of their other yokai pals!) This series became just as iconic as the like of Godzilla or Pokemon in it's home country. It spawned LOADS of adaptations!
An iconic manga/anime series made by the legendary Shotarou Ishinomori! It's about eight cyborgs, including the main man 009, who try to stop the organization who created them, Black Ghost from attempting to control the world with military might. Besides that, this series was one of Ishinomori's greatest works!
Interested in one or more of these? Here's some quick-start resources as well as adaptations I recommend!