Kaiju No. 9 is the main antagonist of the Kaiju No. 8 manga and anime. As one of the numbered kaiju, he first appears at a Defense Force testing site, where he brings other defeated kaiju back to life. From that moment on, he becomes a persistent danger, orchestrating assaults, resurrecting more monsters, and pursuing greater strength to challenge the Defense Force.

Kaiju No. 9 initially had a gaunt appearance, being a tall, thin kaiju with a set of jagged teeth exposed. His head appears to have a set of two protuberances stacked onto each other. Underneath his head are small, sunken eyes that are not visible sometime. Because of his shapeshifting abilities, he is able to replicate the appearances of his consumed victims.

Kaiju No. 9 presents himself as calm and composed, yet beneath that exterior lies a ruthless and destructive nature. His true goals remain shrouded in mystery, but his actions make it clear that he harbors a strong desire to bring down the Defense Force and cause widespread devastation. Upon discovering Kafka Hibino's transformation into Kaiju No. 8, he becomes fixated on acquiring that same power.

ENGLISH VA: Alejandro Saab (Kaigaku, Sae Itoshi)