While Eggman Nega is eerily polite in both manners and speech, he is just as cruel, cold, and calculating as Dr. Eggman himself; though he appears to be slightly more unstable, as he does not seem to care should the world perish if his plans to conquer it do not proceed as initially designed. Both scientists display an obvious lust for power and an extreme disregard for all life, characteristics that enabled the villains to collaborate several times in the past before Nega's own power lust and ambition to alter his future overcame these partnerships. He appears to be insane, trying to destroy the whole world along with himself on numerous occasions. He has also been described as very sneaky, even disguising himself as Dr. Eggman during the storylines of the Sonic Rivals series. His downside, however, is that he can sometimes lose track of important details while making unnecessary speeches much like his ancestor Dr. Eggman.