Izuna Kuda, a vibrant first-year at Hyakkiyako Alliance Academy, dedicates herself to the Ninjutsu Research Club while relentlessly pursuing her dream to become Kivotos' greatest ninja. She addresses her teacher as "Lord," reflecting her intense training devotion. Her bright, energetic nature radiates through an infectious smile, yet her unconventional ambitions sometimes spark peer misunderstandings, leading to spells of solitude that belie her cheerful spirit.

On the battlefield, she operates as a frontline Mystic Striker, specializing in sustained damage through rapid strikes and high agility. Her combat toolkit includes "Izuna Ninja Scrolls!" for tactical repositioning and attack speed enhancements, while "Secret Weapon, Exploding Shurikens!" unleashes area-of-effect devastation every sixth normal attack. Passive skills synergistically amplify her critical damage and attack power.

During the Cherry Blossom Festival, deception by an evildoer temporarily cast her as an antagonist, believing her actions furthered her ninja goals. Recognizing the truth, she allied with the protagonists and later supported events like An Unconcealed Heart and the Momoyodou Beach Bar Franchising Plan. Bonds with Schale's Sensei and clubmates Michiru and Tsukuyo fortify her resolve. In the 1.5th Anniversary Short Animation, she aided the Foreclosure Task Force and Prefect Team to quell automated turret chaos at a mall summer sale.

A swimsuit variant highlights her summer training focus, targeting water-technique mastery during an operation to dismantle a scam syndicate. This version employs bubble-based assaults and critical-hit-activated speed boosts. Her journey across narratives traces a shift from isolation to profound friendships, all anchored in her unyielding commitment to the ninja path.