Most likely not, or very possibly Tri Stat. Given the nature of the protagonists, tying them to an RPG system would be difficult, since they have the ability to regenerate from any wound and a somewhat arbitraty level of combat ability. (essentially defined as however much the plot requires.) In Hellsing, it's not really the outcome of combat that's interesting, but the situations and characterization in and around the fights.
(The main reason for this is that Alucard, the main character, is a true immortal, but wishes to die. Therefore, most of the time during battle, he just stands around getting torn to shreds until he finally concludes that his opponent can't kill him, at which point he generally breaks them psychologically before killing them.)
This isn't exactly easy to represent in an RPG, although I might give it a go with RISUS.
