Piccolo  He is one of  the characters who was originally "evil", but through series of  unexpected events, the "evil" in him was slowly washed away as  Piccolo took different forms. Piccolo is the offspring of  Daimon, who was the pure "evil" which separated from Kami-sama as  another body. Piccolo and Kami-sama is one person in two bodies. If  one of them die, both will die. When Daimon was killed by Son  Goku, he vowed that his offspring Piccolo will avenge him. Thus,  Piccolo's character is not just pure "evil" the way Daimon is. He is  simply focused on destroying Son Goku. The two of them first met in  the Budokai. Because of the arrival of Raditz, Piccolo found  himself an unwilling partner of Son Goku and together defeated  Raditz. When he learned that two more poweful Saiyajin will avenge  Raditz, Piccolo only found himself even more unwillingly on Goku's  side by volunteering to train his Son, Gohan to become a warrior to  fight against the Saiyajin. Piccolo's militant training style  made Gohan a stronger person, gradually unleashing Gohan's  tremendous talent. During the time he spent with Gohan, Piccolo  began to develop love and care for Gohan, which was fully realized  when he sacrificed his life for Gohan in the battle against Nappa.  His love and care for Gohan is readily apparent throughout the  Freeza and Cell series.