A kunai is a basic Japanese gardening tool that, in the hands of a martial arts expert, can be used as a multi-functional weapon. The kunai is commonly associated with the ninja.
- Marino can use energy kunai in Mega Man X: Command Mission.
- In Mega Man X DiVE, Halloween Marino's Active Skill Scattering has her throwing a large energy kunai.
- Hidden Phantom and Model P use kunai.
- Kunai, a Battle Chip from the Mega Man Battle Network series.
- Kunai is used by Shadow Man in the Archie Comics Mega Man series. It is also used by Espio the Chameleon and Espio Man in Worlds Collide.