Shiori

Shiori and Koruru are one of the most influential teams in the tournament, because Koruru was the reason Gash aspired to become a kind king.

Shiori first found Koruru on the streets of Mochinoki city and brought her to her house. After learning that Koruru had no family, she insisted that Koruru stay and even offered to be Koruru's big sister, trying to make herself a caring and nurturing mother, compared to the lack of attention she received from her own family.

(Source: Zatch Bell! Wiki, edited)