Kyuku Zuzu

Kyuku Zuzu (キュクー・ズーズー) is a minor character in the Overlord anime (appearing in Season 2 during the Lizardmen arc).

He is the chieftain of the Razor Tail tribe, one of the five lizardmen tribes that form an alliance against the forces of Nazarick.

Kyuku wears the White Dragon Bone, one of the legendary Four Treasures of the Lizardmen. This enchanted armor—made from frost dragon bones—greatly boosts his physical power and durability (making him nearly invulnerable to normal attacks), but at a severe cost: it sacrifices and permanently reduces the wearer's intelligence, turning him from presumably a wise leader into someone who speaks only in simple, basic sentences and acts more instinctively/barbarically.

In the story, he participates in the desperate last stand against Cocytus, charging forward in his armored form as one of the final surviving chieftains.