Well, I'm fine with getting excited about these all on my own. I think it's cool how these famous mangaka were so willing to share what they made before becoming famous.

Mine Yoshizaki made Keroro Gunsou which is an absurdly long-running manga series. It started in 1999 and it's still ongoing. He really liked old video games like Vampire.
https://exhentai.org/g/2965693/e8aeda7fbf/