Sonia Shaflnarz is best known as the unlikely antagonist with a hidden vendetta. She comes from a Sicilian mafia family and made her way to Japan specifically to settle a score with the Sanzen'in family—they were indirectly responsible for her father's death, which left her determined to seek revenge.
To get close to her targets, Sonia poses as Sister Fortesia, a nun from the Church of Alexander Mark and the Tiger's Pit for Butlers. The disguise lets her approach Hayate and infiltrate the Sanzen'in household. Fans often note the irony of her using a religious cover while operating on pure revenge.
Despite speaking fluent Japanese, Sonia deliberately affects a harsh, crude manner of speaking and claims it's because she doesn't know the language well—a thin excuse that fools no one who pays attention. Her fighting ability is genuinely impressive, relying on tonfa weapons and physical strength that borders on superhuman. She's one of those characters who's far more capable than her cover story suggests.
Content compiled by AnimeList.moe from publicly available sources.
