Professor McGonagall's Tabby Cat Form

Professor McGonagall's Tabby Cat Form, an Animagus transformation featuring a tabby cat with distinctive square spectacle-like markings around the eyes, debuts in the first book as a mysterious watchful presence outside Privet Drive, capable of reading the letters addressed to Harry. Though sparingly utilized in subsequent books, this form underscores McGonagall's vigilance and Transfiguration mastery throughout the series. It reappears subtly in later conflicts, symbolizing her enduring role as a protector amid escalating threats from Voldemort.