Krillin
Even though Krillin is the most powerful human on Earth, Krillin's power is lesser than that of The Saiyans. At first, Krillin was Goku's enemy when they were little, but they soon became friends and trained together under Master Roshi. Krillin is very dedicated to protecting the Earth, and is at Goku's side fighting whenever he can, which we can see when Vegeta and Nappa first arrive on Earth. And again when he fought Frieza, showing he would do anything to help his friend mainly by helping out Gohan to get healed and not killed by Frieza. Krillin is a Buddhist monk, and shaves his head optionally. Later on, Krillin marries Android #18, and has a daughter, Marron. Krillin is my pick for favorite next to Goku=)
