Nail is the protecter of his father,Guru. Nail is Namekian,the second strongest 1. Piccolo is the strongest 1,but Nail fougth with Frieza,he lost. It was only to give the other people(Gohan & Krillin) the time 2 find the Dragonballs. Later,Nail almost died,but Piccolo founds him. Piccolo merges his body with Nails Body. Then they take it up with Frieza.