Vittorio Malvora

" Vittorio Marvola" is a White Court vampire member of the House Marvola, Harry called him "Grey Cloak" before learning his name.

Biography
During the events of White Night, Vittorio was involved in a plot to "cull" magically attuned women in an attempt to limit the power of Humanity in the long term and also as part of a power play within the White Court. While Harry was investigating the deaths of these women Vittorio attempted to kill him with fire bombs, and Harry eventually managed to track him to his subterranean lair using Little Chicago.

While monitoring Vitto in his lair, Harry witnessed him communicating with Cowl thus tying him to the “Black Council” conspiracy.

By the end of White Night, Harry challenged Vittorio and Madrigal Raith to a duel that devolved into a massive battle, during which it was revealed that Vittorio was possessed by an Outsider, and was assisted by Cowl in attacking Harry. The conclusion of the battle involved Harry blowing everything to kingdom come, presumably including Vittorio.