You just need to make a system of skills that is not tied to the hero and we ourselves chose what he would be, so that from a child who at the beginning does not know how to do anything and cannot, we could "grow" a real warrior. Two options for the pumping system, the first, which you use, you pump, and the second option, any action adds points, we get a level and choose the desired skill, skills can be thrown off and distributed over a new one, for science points)