V is a blonde or a brunette

He reminds me of Alan cumming in his role as Emcee ngl. 

Though idk about his hair color.. hmmm

The black inc (in his tattoos and hair) is contracts with Griffon, Shadow and Nightmare. Tattoos dissapear when Griffon and Shadow are activated, while activating Nightmare affects only hair as it becomes white

So he's naturally white-haired