There's a character named Magnus in the story description, oh wait, there're more at the bottom...and its something about Alucard sucking girl's blood......Maria will go bitchslap him I bet if it is true
About the cast, here are some noticable names if you play much JPN games and watch too much Anime:
Alucard
Miyano Mamoru (Light Yagami-Death Note, Suou Tamaki-Ouran Host Club)
Richter
Miki Shinichiro (Ryusei Date-Super Robot Taisen, Fujiwara Takumi-Initial D)
リュドミール
Matsukaze Masaya (Hazuki Ryo-Shenmue, Ootori Kyoya-Ouran Host Club)
Magnus
Suwabe Shunichi (Greed-Full Metal Alchemist, Sting Oakley-Gundam Seed Destiny)
Alexis
Namikawa Daisuke (Sumaru-Naruto, Kamisama-Saiyuki Reload)
Why not use the original Seiyuus they used in NITM! Damn!
As for the artwork, I did a little research, its done by Kagero, it's a team's name which contains two members.
Their site:
http://initiative.xrea.jp/