Bento was one of the military survivors from the Buff Clan attack that evacuated to the second Sixth Civilisation excavation site. An engineer, he initially co-piloted the Ideo-Delta, until he moved across to the same role aboard the Ideo-Nova. This allowed him to monitor the Ideon's engine room when it was in combined form. When not on the Ideon, he assisted Joliver in the Solo Ship's engine room.
He was generally an easy-going sort, accepting Gije in a very short time. He managed to survive two fatal attacks on the Ideo-Nova, outliving both Moera and Gije. However, he was the first person onboard Ideon to die in the final confrontation with the Buff Clan, being killed when the engine room took a direct hit from the Gando Rowa.
Appropriately, when the colonists are reunited in spirit form, he hung around unobtrusively with Tekuno.