Goku and Krillin best friends since kid classmates under the watchful eye of the legendary martial arts master, Master Roshi. Krillin showed great concerned whenever Goku was hurt. Example, in the first fight between Goku and Jackie Chun (Master Roshi) . When Goku transformed into an Oozaru and Jackie Chun had to Kamehameha the moon in order to win the match and save the world. Krillin felt despair, thinking his best friend, Son Goku, was dead. He had strong feelings, but not enough to get revenge. Krillin has always had cowardliness to him. He was always scared of bigger threats. So the friendship was/is one-sided. When Frieza killed Krillin in DBZ, Goku’s love for him caused him to go super-saiyan. But Krillin was scared of Piccolo, Goku's former arch-enemy that killed him, therefore he