Yoyo Oo wears a helm with 4 spheres inside it. He has lanky body and limbs, bionic legs and wears dark blue clothing. His eyes are covered by what seems to be a visor.
- It is possible that Yoyo Oo is an alien of the Kubulus race but with bionic legs.
- From the fan mail section in the official BoBoiBoy magazine, it is revealed that his brain, which is a helm with 4 spheres inside it, is made to make him smarter.
- Unlike other cube head alien (Kubulus), he doesn't have antennas.
- His power is Mechamancer.
- Yoyo Oo's name can be considered a pun to local Malaysian's verb which used to question an overconfident scenario.
- In the official comic book of BoBoiBoy: The Movie, his name is spelled as Yoyo 'O.
- In the official end credits of BoBoiBoy: The Movie, his name is spelled as Yoyo Oh.
- Yoyo Oo's voice sounds like Toad from Super Mario Bros. franchise,