For me it would be son Guko from dragon ball , not because his over power but because of his willingness to help others , even if his not from the planet earth he still wants to save it also Guko has a pure heart enabling him to ride the flying nimbus that only the people with the purest heart can ride it , Guko is always persevere in all things he got his strong power and body because of training hard to achieve his power. Last is he is so friendly to animals i remember that one time in which their was an event that he got late because of protecting a dinosaur that is hatching its egg. that all :)