Luca Scarlet

Luca is cheerful and somewhat bolder than Rebecca. She has no hesitation about teasing her older sister over romantic matters and encourages Rebecca to be more assertive with Asta.

Like the other Scarlet siblings, Luca is closely attached to her family. Her characterization primarily comes through domestic scenes, where she contributes to the lively household that Rebecca works hard to support.

No magic attribute, grimoire, named spell, or combat ability has been established for Luca.

She is portrayed as a civilian rather than a Magic Knight or combatant, and her appearances focus on family life in Nairn rather than magical conflict.

Luca appears as part of Rebecca's family after Asta accompanies Rebecca home to Nairn. Her presence helps establish why Rebecca works so hard and takes on a parental role despite still being a teenager herself.

When children from Nairn are abducted, the threat to local families draws Asta, Gauche Adlai, and other characters into the confrontation surrounding the kidnappings.

Luca continues to appear with Rebecca and the other Scarlet siblings in later scenes, particularly when the story returns to Nairn or shows Rebecca's home life.

Rebecca Scarlet is Luca's older sister and the primary caretaker of the Scarlet siblings.

Marco Scarlet is one of Luca's younger brothers.

Pem Scarlet is another of Luca's younger siblings.

Asta becomes familiar to Luca through his friendship with Rebecca, and Luca encourages her older sister's interest in him.