Taida na Akujoku Kizoku ni Tensei Shita Ore, Scenario o Bukkowa Shitara Kikaku-gai no Maryoku de Saikyou ni Natta - Ch. 10 - Each of Their Growth

[Oakheir]

Dragonball didn't need to be an isekai.

What are you talking about? Dragonball is already an isekai, just think about it. Goku literally came from a different planet, and was pretty much hostile to everything until he fell and hit his head on a rock.