The yellow Isabelle represents Lissa, a young girl who features blonde hair tied in twin pigtails and wears a yellow dress.
The black Chrom and blue Robin minions are based on their appearance in Fire Emblem Awakening, who serve as members of the party Lissa belongs to.
Other trivia:
This spirit's Support type references Lissa's role as a member of Chrom and Robin's party in Awakening.
This spirit's Fairy Bottle Equipped ability references Lissa's Cleric class, which allows her to restore a party member's HP.
In World of Light, the Lissa spirit is located in the Coliseum from the Fire Emblem universe in the Mysterious Dimension map.
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Younger sister to Chrom, Lissa is the resident Cleric of his militia group, the Shepherds. Lissa is, in fact, the one to formally introduce Robin to the group. She fights to protect her friends and family, including the noble Maribelle and her older sister, leader and Exalt of Ylisse, Emmeryn.
