The main antagonist in the manga Kaiju No. 8. Kaiju No. 9 is a humanoid numbered Daikaiju who goes around reviving the kaiju killed by the Defense Force. He previously infiltrated Professional Kaiju Cleaning Company Monster Sweeper.

Spoiler

In his fused form with an Ant-type kaiju, No. 9 has the lower part of his body replaced by an Ant kaiju which he controls and uses to move around. In this form, No. 9 lacks forearms and hands.

Spoiler

After fusing with Kaiju No. 2, No. 9 is now much larger than before, keeping his darker skin tone, with a long tail, three sets of eyes, and only protuberance on his head instead of two.