Nick Tanaka is a supporting character in Eureka Seven AO. He is a U.S. military officer who serves as an antagonist in the series. He is depicted as a male adult with black hair and black eyes, often wearing a military uniform, beret, and goatee. His role in the story involves capturing the protagonist Ao Fukai and holding him aboard a carrier vessel. This action prompts the characters Fleur Blanc and Elena Peoples to launch an attack on the carrier in an attempt to rescue Ao. Nick Tanaka's motivations are aligned with the military and governmental forces that oppose Generation Bleu and its allies. He has little personal development or backstory provided in the series, functioning primarily as an obstacle for the main characters. His notable abilities are those of a commanding officer, including leadership and tactical oversight of military operations.