Nayuta Izumi is a supporting character in the anime Snowball Earth and a member of the organization known as E-RDE's Light, also referred to as Vierde. He is depicted as a male teenager with medium-length blue hair and blue eyes, often seen wearing a jacket, gloves, and boots with a braid in his hair. Nayuta is a belligerent and aggressive fighter who takes an active role in combat situations, serving as the frontline executor of the group's hostility. He commands a bat-type monster named Ares, named after the Greek god of war, which has sacrificed its ability to fly in exchange for greatly enhanced physical strength and heat resistance, making it a formidable close-combat weapon.

Nayuta's background is rooted in his deep loyalty to the leader of Vierde, Isseki Sagami, whom he follows with near-religious devotion. His motivations initially stem from a desire to prove his worth within the organization and to carry out Sagami's will, which includes opposing the protagonist Tetsuo Yabusame and dismantling the myth of the savior. Nayuta's personality is defined by his combative nature and a strong dependence on Sagami for direction and purpose, masking a underlying sense of loneliness and a need for belonging. In the story, his role shifts from a threatening antagonist who attacks the human survivor community of Mishima Mall to a reluctant ally after the revelation that Vierde's actions were manipulated by a larger, hidden threat. Following Sagami's death, Nayuta begins to reassess his purpose and eventually joins forces with Tetsuo and the other survivors, using his knowledge of the terrain and combat skills to help find a new base and defend against common enemies. This development shows his growth from a purely destructive force into a more nuanced character capable of cooperation and protecting others. His notable abilities include piloting the powerful monster Ares in close-quarters battle, as well as his strategic knowledge of the frozen world gained from his previous reconnaissance missions.