In my opinion the manga series Hellsing can be easily adapted into film with the right script, cast, and crew. So first off here is my fancast for Hellsing starting off with...
The Hellsing Organization:
First off the miscellaneous soldiers and Wild Geese members can be played by extras so it wouldn't be a hassle to round up those actors. Now onto the core members of the Hellsing organization.
Alucard/Vlad The Impaler/Count Dracula-Cillian Murphy
Why: The name I see must tossed around for the role of Alucard is always Adrien Brody. But I never thought he quite fit the role, sure he had some physical characteristics as our resident vampire but thats about it. To me Cillian would be able to bring the multi layered personality of Alucard to the big screen.
Sir Integral Fairbrook Wingates Hellsing-Tamsin Egerton
Why: I first saw her in the short lived Camelot series on Starz, and I really enjoyed her performance as Guinevere. To me she has that aristocratic and confidant air that makes her perfect for the role of Integra
Seras Victoria-Talulah Riley
Why: Talulah is a great actress, I think she can pull off the innocence that Seras Shows in the beginning of the series, but gradually mature as the movie plays out.
Walter C. Dornez-Bill Nighy
Why: Nighy has always been a favorite actor of mine and has shown that he can play the older, smooth, gentlemen that serves as a foil to his costars insanity. He is also the right age and has a slight resemblance to Walter.
Walter C. Dornez (vampire/rejuvenated)-Joseph Gordon-Levitt
Why: I wanted to find a good actor that could also (if only slightly) pass as a young Bill Nighy and Levitt just seemed to fit.
Pip Bernadotte-Jamie Bell
Why: Bell was the only reason I enjoyed The Eagle, I first saw him King-Kong. Another actor I considered for Bernadotte was oddly enough Rupert Grintt.
Millennium:
The Major-Phillip Seymour Hoffman
Why: Hoffman is one the greatest actors of our age, and I think he can pull off insane and sinister just fine to play the Major. He has also had his fair share of playing bizarre characters in the past.
The Captain-Til Schweiger
Why: Great actor and he has the hulking physique The Captain is known for.
The Doctor-Christian Oliver
Why: I have honestly not seen any of his films over than "The Good German" and he was great in that. If I remember correctly he was also in Speed Racer...which we all know was horrible.
Tubelcain Alahambra-Oscar Jaenada
Why: In my opinion his character in "The Losers" could of been better, yes he was awesome but they should gave him more lines etc. I think doing a film like Hellsing with it's large fanbase would give him more exposure on an international level.
Rip Van Winkle-Olga Kurylenko
Why: Kurylenko has the youthful look that Rip Van Winkle is known for and is a capable actor.
Now onto Schrödinger...I could honestly not find an actor that would fit this role. So if you have any suggestions leave a comment below!
Iscariot:
Alexander Anderson-Liam Neeson
Why: Neeson is no stranger to playing a badass, throw in some religious extremism and you've got the perfect Anderson.
Enrico Maxwell-Tom Felton
Why: He's known for playing a conniving, power hungry snake in the grass, so playing Enrico wouldn't be to much of a stretch for him. This would also be a chance for Felton to show his acting skills in a more mature and deep role.
Heinkel Wolfe- Garret Hedlund or Mia Wasikoska
Why: Due to "it's" androgynous appearance it was kinda hard to cast Wolfe. So I chose an actor and actress.
Yumie Takagi-Keiko Kitigawa
Why: I loved her in the drama Buzzer Beat and would like to see her in a more serious role.