Iono is the Gym Leader of Levincia City in the Paldea region, a role she holds alongside her career as a popular online streamer and influencer. She is the host of a widely followed livestream known as the Iono Zone, where she often incorporates her duties as a Gym Leader into her content. Her appearance is distinctive, featuring pink and teal hair styled with a bow-like shape at the front, sharp, pointed teeth, and pastel Magnemite-themed hair accessories that can move independently to reflect her expressions. In the anime, she has occasionally appeared without these accessories, which she considers a more genuine representation of her true self.

Iono has a deeply extroverted, vivacious, and energetic personality. She is portrayed as a highly enthusiastic celebrity who prioritizes viewer engagement and channel growth, never missing an opportunity to collaborate with other popular figures to boost her audience numbers. Her use of unique catchphrases and a playful, exaggerated communication style reflects her complete immersion in the persona of a streamer. Despite her fame and somewhat overwhelming public presence, she is consistently shown to be a kind and considerate friend, particularly to her fellow streamer Dot, whom she supports with genuine care and understanding.

A significant aspect of Iono's backstory is her pre-existing friendship with Dot, the reclusive streamer behind the online persona Nidothing. Iono's livestreams served as a source of inspiration for Dot, helping her decide to join the Rising Volt Tacklers. Keeping Dot's true identity a secret, Iono acts as a mentor and older sister figure to her, providing advice, encouragement, and practical help. She is one of the few people outside of Dot's immediate circle who knows that Dot and Nidothing are the same person.

In the story of Pokémon Horizons, Iono first appears when Dot contacts her for help in locating Liko, who has become lost and suffers from amnesia in Levincia. Seizing the opportunity, Iono proposes a collaboration stream with Nidothing, turning the search for Liko into a public game similar to her Gym test, which proves successful in finding her. This establishes her as a reliable ally to the Rising Volt Tacklers.

Her involvement deepens when she is selected to be Dot's official evaluator during the Terastal Training arc. Understanding Dot's stage fright, Iono creatively allows her to conduct their training battle in her Nidothing persona. The battle itself is a competitive match where Iono ultimately wins, demonstrating her strength by using her signature Pokémon Bellibolt and Terastalization to overcome Dot's Quaxly. Despite her victory, she approves Dot's progress, showing her primary goal is her friend's growth as a trainer. Following this, Iono partners with Dot in a Tag Battle against Elite Four member Poppy, showcasing their strong teamwork and strategic coordination. Throughout these events, she continues to support the Rising Volt Tacklers, even helping them find a safe location to hide and repair their airship, the Brave Olivine.

Iono demonstrates notable abilities both as a trainer and a strategist. She specializes in Electric-type Pokémon, with her constant companion and primary battling partner being her Bellibolt. In battle, she employs clever tactics and effectively utilizes her Pokémon's abilities, such as Bellibolt's Electromorphosis, which powers up its electric attacks after taking damage. She is also a capable user of Terastalization, using it to turn the tide of her battle against Dot. Beyond battling, her greatest asset is her exceptional skill as an online entertainer, using her platform and social influence to mobilize crowds and solve problems in creative ways.