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Creedy: Die! Die! Why won't you die?... Why won't you die?
V: Beneath this mask there is more than flesh. Beneath this mask there is an idea, Mr. Creedy, and ideas are bulletproof. IMDb
O rosto de V nunca foi importante, ele foi representado como uma Idéia no cinema.
Even in the novels, V's true identity is a mystery and he visibly removes his mask only once during the entire story (at Surridge's request), at which point his back is to the reader and his face cannot be seen. Surridge tells him "it's beautiful", in contrast to her personal notes, where she mentions that the man in cell V was ugly. Wikipedia
Portanto, ele era uma ideia ou um símbolo, não um rosto e tanto o romance como o escritor de cinema deliberadamente não mostram o rosto.