I rather see an anime film adaption of Castlevania starring Leon Belmont from Lament of Innocence
(Supposely the first Belmont) or Christopher Belmont from the GB games of Adventure/Belmont's Revenge and make it all bloody, dark and gritty like Vampire Hunter D/Vampire Hunter D: Blood Lust. Get the Star Trek: The Next Generation cast to do the voices like Michael Dorn, Marina Sirtis, Levar Burton, Patrick Stewart, Jonathan Frakes, Brent Spiner, Colm Meaney, Geneviève Bujold from Voyager, Keith David from Gargoyles and David Warner from Tron because they really have great voice acting and they were awesome in the Gargoyles cartoon series. Sonia Belmont from Legends was removed from the Castlevania timeline by Konami and so was Castlevania: Legacy of Darkness and Castlevania 64.
Castlevania: Legacy of Darkness and Castlevania 64 are both set a few years apart but are the same game and originally were one game called Dracula 3D for the Nintendo 64DD but they were seperated into two games instead.
Keith David should voice Count Dracula (Vlad Tepes/Mathias Cronqvist) or play as a Belmont or maybe a big monster or a devil forge master like Hector from Curse of Darkness.
Anyway a live Castlevania film just won't work or be any good. Either make it into an anime film (OVA) and let Madhouse anime it like they did Cyber City Oedo 808 OVA or have Konami make a full CGI film like Resident Evil: Damnation like Capcom/Sony did.