- King Kingo is Bongo's father and the king of Planet Dodonpa. When he first appears, his throat was in pain due to having something sharp stuck in his throat. The sharp object was unable to be removed even by the royal doctors, so he was not able to eat curry (Dodonpa residents' delicacy) as a result. With him unable to eat curry, a ban of eating curry has been put up in Planet Dodonpa so that the residents may feel the king's pain. Once the Jetters obtained the unique cough drops in the universe, they return to Planet Dodonpa and cure King Kingo and the ban on curry is lifted.
- Queen Ringo is Bongo's mother. She is the wife of King Kingo and queen of Planet Dodonpa.
- Banjo is Bongo's older brother. Not much is known about him.
- Bingo is Bongo's older sister. Not much is known about her.
- Bondo is Bongo's middle brother. Not much is known about him.
- Bengo is Bongo's middle sister. Not much is known about her.
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