Sanada embodies unwavering loyalty as head maid to the Valhalla Royal Family, channeling fervent devotion toward Princess Valkyrie. Her fixation on Valkyrie’s youthful guise sparks theatrical outbursts of adoration, often blurring professionalism with whimsy. This zeal once drove her to forge a "Cat Ear Gun," weaponizing Earth girls into a brainwashed Catgirl Maid Brigade—a scheme born from misjudged suspicions about Kazuto Tokino’s associations. The squadron maintains civilian autonomy unless summoned under Sanada’s command, a hierarchy others tacitly accept.

A tactician of lethal precision, she spearheads combat strategies against threats like Hydra while shielding Valkyrie from harm. Season 3 unveils her clandestine superhero persona, complete with handcrafted figurines gifted to Valkyrie and covert missions that twice land her in custody. Though prone to flamboyant antics, she intermittently reveals lucid empathy, extending sincere guardianship over Kazuto’s inner circle alongside her chaotic exploits.

Her dynamic with Princess Liane simmers with Valhalla-era rivalry over Valkyrie’s favor, yet she forges an unexpected camaraderie with Princess Mehm, defying ceremonial boundaries. Initial antagonism toward Akina Nanamura dissolves into steadfast rapport post-conflict resolution. Sanada fiercely champions Valkyrie’s romance with Kazuto, engineering chaotic yet well-intentioned schemes to accelerate their bond, despite frequent collateral upheaval.

Evolving from zealous retainer to a layered ally, she navigates Earth’s rhythms by co-managing the Tokino Bathhouse and joining communal ventures—from karaoke showdowns to artifact hunts. Her growth intertwines duty with accountability, as she grapples with the moral weight of her brainwashed maid legion yet upholds their altered state, cementing her journey from rigid devotion to nuanced self-awareness.