Warning: Contains spoilers for Kaiju No. 8 chapter #117.Of all the mysterious elements in Kaiju No. 8, the most mysterious is the bug-like Kaiju that gave Kafka his powers in the first place. Little to nothing has been said about its origins or motives, and the fact that its a Kaiju that wants to kill other Kaiju only makes it more mysterious.
https://screenrant.com/kaiju-no-8-chapter-117-bug-kaiju-reveal/