Dersu Nizhny is a 16-year-old male character with blue eyes and short blue hair that falls to his ears. He typically appears wearing goggles, a cap, gloves, a hoodie, shorts, and tights. His role in the series is a supporting character.

Dersu possesses a quiet and reserved personality, rarely displaying his emotions in front of others. He has a combative and wild nature, which can become uncontrollable when he is angered. Despite his typically stoic exterior, he opens up significantly in the presence of his one and only close friend, Ignate. This friendship is a key aspect of his character, as Ignate is the primary person with whom Dersu feels comfortable revealing his true self.

Within the story, Dersu inherits a Buranki named Anba, which corresponds to the right leg of the giant being Zampa. His combative instincts and his role as a pilot of this Buranki unit define his active participation in the events of the series. His development is closely tied to his relationship with Ignate and his ability to manage his fierce temperament.