Shella, a high-ranking succubus of the Demon Realm’s Moderate Faction, once reigned as her kind’s most powerful figure before transferring a substantial share of her strength to her youngest daughter, Maria Naruse, at birth. Her appearance mirrors Maria’s, marked by silver hair, purple eyes, curved horns, and pointed ears, often complemented by a white lace dress and black hair ribbons.

Her history intertwines with Wilbert, the former Demon Lord, their relationship rooted in mutual grief over lost spouses, which led to Maria’s conception. She previously bore another daughter, Lucia—also called Rukia—who serves as Wilbert’s aide. Shella’s past includes ties to Zolgear, a once-compassionate ally whose descent into brutality followed his wife’s death.

During Zolgear’s rebellion, Shella was abducted to manipulate Maria’s actions. He falsely announced her death to crush Maria’s resolve, but Yahiro Takigawa orchestrated her rescue. After Zolgear’s defeat, Shella safeguarded his former subordinate Zest from factional vengeance, later transferring her guardianship to Basara Toujou during his demon realm visit.

Known for her cheerful warmth, Shella prioritizes her daughters’ well-being and extends protective concern to Basara’s allies. She actively mediates conflicts, such as intercepting Lucia’s attack on Kurumi Nonaka, to preserve unity. Her political insight, including awareness of Jin Toujou’s dealings and recognition of Wilbert disguised as Ramusas, underscores her strategic role.

Though diminished in raw power, Shella wields advanced spatial magic, crafting portals for instant travel. Her tactical knowledge and enduring influence within the Moderate Faction aid her navigation of the realm’s volatile politics, balancing familial loyalty and alliance-building to counter threats across shifting power struggles.