The default female Robin represents Dorothea, a female Mage who wears a black-and-white outfit and wields a magical tome during battle.
The Jigglypuff minion's Sing references Dorothea's Songstress ability and former career as an opera singer.
The stage features Edelgard as a background character, referencing Dorothea's affiliation with the Black Eagles house in Fire Emblem: Three Houses.
Robin's Thunder references the Black Magic spell of the same name that Dorothea starts with in Three Houses, allowing her to attack with lightning.
Other trivia:
This spirit's Support type references Dorothea's role as a member of Byleth's party in the Crimson Flower route of Three Houses.
This spirit's Electric Attack ↑ ability further references Thunder, the Black Magic spell Dorothea starts with in Three Houses that allows her to attack with lightning.
