The only thing in Dragonball thats the same are the names, thats it and frankly I'm shocked they bothered to pronounce them correctly or use them at all. I know what you mean about Daredevil and the Kingpin being black, but there are so many worse things in Daredevil that it didn't really bother me much past first seeing that he was black, and I quite like the guy that played him.
I think though even taking it as a non-dragonball fan that whole teenage thing is done exactly the same way in every single movie with teenagers in. Look at Spiderman, The Forbidden Kingdom, Transformers. Its always the same dorky guy getting bullied by jock, dock likes jocks girlfriend, girlfriend pities dork, dock goes on adventure, dork wins girl. There are only ever small variations to that formular.
By the by Dragonball was based on Monkey Magic (The funkiest monkey that ever walked) the first few episodes are almost identical, then it starts becoming its own thing. Goku means Monkey, Monkey from Monkey Magic is based on the Monkey King who is a very important figure in Chinese mythology, he's like Loki the God of mischief. And to connect this to PSO the Monkey King Bar is based on the Monkey Kings staff. And the spiky hair in PSO is likely based on DBZ's SSJ hair.
Not a great example you can't really see it correctly but it is almost the same.