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.