Ion Nanana is a supporting character in Future Card Buddyfight Ace. She is the niece of Paruko Nanana and the maternal cousin of Yuga and Haru Mikado. Ion serves as a combat commentator during Buddyfight tournaments, a role she shares with her buddy monster from Hero World, Martian UFO, Takokichi. This mirrors the commentary function previously held by her aunt, Paruko.

As a Hero World Buddyfighter, Ion partners with Takokichi, who frequently transports her to events via UFO. Together, they provide live coverage and analysis of major Buddyfight matches. Takokichi displays an excitable personality during broadcasts, offering energetic narration alongside Ion. Unconfirmed trivia suggests Takokichi might be the offspring of another character named Martian UFO, Takosuke.

Ion consistently appears with Takokichi during tournament storylines, often depicted arriving via their signature UFO. Visual media exists showing her full design and interactions, such as with Yuga Mikado. Her documented role remains focused on providing commentary support at competitive Buddyfight events, maintaining her familial connection to the Mikado family.