Janus Tepes from Marvel Comics is kinda hot. Slayer from Guilty Gear is a cool classic handsome daddy. Vampire: The Masquerade – Redemption's Christof Romuald is a niche guy who's awesome. Jurgen (Sam & Max) is cute and funny option. Demitri Maximoff (Darkstalkers) is vamp noble so full of him; would be funny to make him a hungry bottom. Doctor Jonathan Reid of Vampyr is a hot dude. For a more monstrous looking, the classic Nosferatu. A male version of Rayne from BloodRayne will be great. While not originally a vampire game, Zeke Dunbar in the dlc Infamous: Festival of Blood becomes one.
(Oops, I just saw you already have some characters considered for this. Ignore this then.)