The Onion Monster (Raksasa Bawang) is a monster that created by Adu Du. Adu Du created Onion Monster to make BoBoiBoy cried and collect BoBoiBoy's tear to activated BoBoiBot. Like his name, he was a onion that Adu Du inserted to a machine and created Onion Monster.
Onion monster is a brave monster, but he is taboo if any other creature says him ugly. He is a person who always smiles cynically with his evil laugh. No matter how brave the Onion Monster is, he is also a little cowardly when he hears the word "cut" or "crush" the onion.
Onion monster is created from an onion through a converter. He is flat and has no fingers with onions as a crest, a mouth that is sewn, and a tentacle that is turned into a ball to fly.
- Onion Wave: The Onion Monster releases a very foul-smelling wave of purple smoke that can irritate the eyes of anyone around it.
- Onion Coil Attack: Onion monster holds, binds or wraps the enemy with a purple coil of light.
- Maximum Onion Aura: Onion Monster produces an aura of onion scent that is more, more rotten and can hurt the eyes of anyone around it with a more terrible aura.