Dragon Ball Z: Supersonic Warriors/Krillin

Krillin is the best friend of Goku and probably the strongest human on Earth. Although he's not exactly a Saiyan and is a little less powerful, he's short and quick and has unique moves that home in on the opponent. A Ki Blast only takes about 15% Ki to execute and, even though he's not as strong as Goku, he can put up quite a fight armed with just Ki Blasts.