Yajirobe is one good guy that is not interested in fighting. He is perfectly content being on the sidelines, usually with food in his mouth, instead of being in the battle. He doesn't willingly go near danger and isn't willling to go in the Pendulum Room to train to fight the Saiyans. Yajirobe does come through in the end when he sneaks up behind the Giant Vegeta Monkey and cuts off his tail. This ends Vegeta's metamorphosis, greatly reducing his strength, and allows the Z fighters to win the day.