Raziel from Legacy of Kain: Soul Reaver, Bat-Man from Arkham Asylum, and Kain from Final Fantasy 4 are all stuck in Fallout 3. Well, they all have the willpower to fight against the constant sense of despair in the D.C. Wasteland. Raziel is fairly indestructible and might even pass for a ghoul. Bat-Man has the intelligence and sturdy moral core to navigate the perils of post-apocalytpia, and the absence of real authority would drive him to work relentlessly to establish some form of justice (once he converted his vast fortune to bottle caps, of course). Kain is likely the odd-man-out, but just try and tell me his jump attack wouldn't be bassass in VATS. I think they would do quite well unless Kain betrays them for some reason, but I'd like to believe Bat-Man would have a contingency plan.