Benji is the younger brother of Bart Geffmon, the leader of the Harvesters. Benji spends most of his time under his brother's shadow, doing what his brother tells him to do, and having very little life of his own. He is dedicated to his brother, but not so much to the Harvesters. Only his loyalty to his brother keeps him loyal to the gang.
 
Benji has a tendency to make unwise decisions--like buying a Type B share from the Coop two years ago.