Kamu is a supporting character who appears during the Renril arc in the second season of the anime. He is a citizen of Renril who actively participates in the desperate defense of his city against the invading Nokkers. Kamu is portrayed as a courageous and selfless individual, consistently demonstrating a willingness to put himself in harm's way for the greater good. His personality is marked by a strong sense of duty and a notable lack of jealousy or pettiness. In a moment that highlights his admirable character, he continues to fight alongside a romantic rival after discovering that a girl he cares for already has a boyfriend, showing his priorities lie with collective survival rather than personal grievance.

In the story, Kamu serves as an example of the human resilience and bravery that define the defense of Renril. He fights on the front lines alongside other citizens like Miguel and Sera, making his stand to protect a hospital from the Nokker threat. His role is that of a capable and reliable ally who provides crucial support to the main characters during the intense conflict. Kamu’s key relationships are forged in the heat of battle with his fellow defenders, particularly Sera, with whom he shares a close comradery. His fate is a tragic one; he is overwhelmed by the Nokkers, becoming covered in them and ultimately crushed by one of their orbs, leading to his death. His development is cut short by his heroic sacrifice, but his actions leave an impact as a testament to the many unsung heroes of Renril. He does not possess any supernatural or notable abilities beyond his normal human strength and combat skills, relying on sheer determination to fight against monstrous foes.