The Badboon is a recurring monster in the Dragon Quest series, first appearing in Dragon Quest II. The large brown-furred primate and its cousins are among the earliest examples of the Beast family of monsters.
Badboons are based on mandrills, Old World monkeys that are native to western Africa in the real world. They are large, brown bulky primates with colourful faces and posteriors. Bulkier than real life mandrills, their stature resembles orangutans and gorillas. The primates made a reappearance in the series in IX after a 22 year absence.
A badboon makes an appearance at the beginning of the story as one of the friendly monsters living alongside Dai and Brass on Dermline Island. However, in the 2020 anime series, it is nowhere to be found.
Badboons first appear on the island of Furrowfield, where three of them are shown attacking Rosie. They spawn naturally in the Furrowfield Forests, giving 10 exp each and having a chance of dropping bark, a medicinal leaf or heartwood (only after the Builder has obtained it in the story).