So I looked up D's powers on this one wiki site - 12,090 A.D.
Reality Altering Powers: D has either acquired new time/ space powers in the latest novels, or has just now been given a chance to use them. D can destroy wormholes with his sword, and create dimensional rifts with a cut, while in space and his lungs bursting from lack of oxygen. He can cut through the very fount of life, as well as the essence of death itself, as proven in his fight against the agents of paradise and the Death Knights. These reality warping powers stem from the fact that D Is unbound by fate/probability. In the latest novel, he was able to override the Akashic records, which contains the entire past, present, and future of the entire universe. Basically, D can warp reality around himself and his sword.
Listen, guys. I'm a die-hard Alucard fan, but this looks particularly grim for ol' Red Eyes. Piss D off enough, what's stopping him from going BACK in time to when Alucard/Dracula, Vlad, etc, etc, was still mortal - hell, back to when he was like, 8, and snapping the poor kid's neck like a twig.
Also, WAY back in the beginning of this thread, someone mentioned that D used a 'psychic wave' or something? This is ALSO VERY BAD NEWS for Ally. The Shrodinger's Cat thing only works so long as Alucard's self-aware. If D went 'Tetsuo' as it was explained, hijack'd Alucard's brainwaves, and decided he wanted to go all Inception-- all he'd have to do is convince Alucard that he simply does not exist. Considering D can tickle the testicles of time-space, cut freaking lightning as naturally as spreading jam across toast, and a horde of absurdly inexplicable powers, and so forth-- although Alucard may have resistance against psychic attack (more than likely), D would be walking up inside his brain easier than picking locks in Skyrim...with the skeleton key.
Honestly, I believe the only reason people are all hopped up on Alucard's Johnson is quite frankly...Alucard's savage and stylish in his ferocity. He'll stand there and grin while you beat him down, reform, then treat you like trash, look you in the eye, and tell you he slept with your mom. Then he'll probably eat your soul like he did the Dandy Man and Rip Van Winkle.
HOWEVER. While D can't or probably doesn't flood a street with hundreds upon hundreds of familiars, doesn't tote around the most badass handguns you could ever dream of owning, and doesn't rock an amazing red coat and glasses - or walk around surrounded in badass bitches, like Alucard does...from a purely technical standpoint...and from a real Alucard fan who's crying as he has to profess this unfathomnable truth to you folks...
D....WOULD beat Alucard. Homeboy cuts timespace like it's going out of style. Dude has access to technology Alucard's not even seen. Dude slices lightning. Deflects lasers. Moves at light-speed. Even without everything else, he moves fast enough that if he were bored and had nothing else better to do, he could just STAND there and confetti Alucard all day, erryday, until his hand got tired. Then he'd switch hands and dice that smirking bastard Alucard for another millennium or so. Ad nauseum. But given that Alucard simply has the ability to exist in multiple planes of reality simultaneously (I mean, really? That's it?)...D would be done with him before suppertime. Probably smoke a cig, practice his expressionless grimace in the mirror a few times, then know that it's all good in the hood.
I know it's hard to swallow guys. We all want to love Alucard, cause he's one bad mo'fo. But let's be real, people. He who controls time itself, has the biggest schvantz. Period.
BTW. I only signed up to respond to this thread. Whattup.