My Hero Academia - Don't cry, don't cry, don't cry, don't cry... *CRY A LOT*

Dragon Ball began back in 1984, roughly 15 months after Fist of the North Star. If anything, they would have shared a teacher, perhaps along with Jojo.

Goku's teacher would have to be from one of those 70's manga that we don't really remember outside of Japan. Like Kinnikuman or Devilman.

Now, where's Goku's picture of him as a kid with Kenshiro?