Fan Casting Eugene Bueller in Fiona Bueller's Day Off (Ferris Bueller's Day Off 1986 Genderswap)

Eugene Bueller is Fiona's uptight, rule-obsessed older brother who serves as the film's primary antagonist. A rigid, by-the-book type, Eugene is consumed by jealousy and resentment toward his charismatic sister's effortless popularity and ability to bend the world to her will. He's a tattletale at heart—the kind of person who derives satisfaction from catching others breaking rules and reporting them to authority figures. Eugene represents the antithesis of Fiona's free-spirited nature: he's anxious, controlling, and desperate to maintain order in a world that seems to reward rule-breakers. His antagonism stems not from malice but from wounded pride and the bitter realization that his diligent, obedient approach to life yields far fewer rewards than Fiona's charming manipulation. He's the embodiment of adolescent powerlessness masked by moral superiority.