How would you design a human transformation

So we're in agreement that humans in dragon ball haven't been useful for anything other than showing how op the main threat is. While this does help push the threat, it makes humans look like dry grass compared to a wildfire. Because this has been repeated constantly, they're just fodder.

Today we change that, and we'll design and give them a new transformation. What will this transformation be, will it help make them less of fodder, and can it be possible for the spotlight to fall to the likes of Yamcha?

Obviously not as strong as saiyans but it'd be nice if they weren't clearly outmatched