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.
Surridge tells him “it is beautiful”, in contrast to her personal notes, where she mentions that the man in cell V was ugly although she mentions “Physically, there doesn’t seem to be anything wrong with him. No cellular anomalies, nothing. He doesn’t even consider “V” his “name”, saying “I do not have a name. You can call me V”.