Alucard (assuming you are talking about the Hellsing Japanese Manga/comic character and NOT the video game ).
Alucard in fact would win this with ease .....and totally frustrate D.
For one I wonder how D can kill a person who simply hasn't been able to die by any known means (be they physical or magical). Alucard has gone through it all, and all that happens is he starts that crazy chant of his, removes restrictions to his powers, and just kills whatever is against him.
I love D .....but against Alucard then I have to give D a D.
but D has also been able to finish all his restrictions before and he hasnt been killed either. Ds parasite also counters alucard's chants, id give him a fair chance.
Hard to say because we dont really have an accurate measure of Ds full power, but he wasnt more powerful than Dracula, just Carmilla and that count guy from the first movie who is also supposedly a descendent of Dracula
However ill just use my favorite argument, in that it is shown that at his full power, he simply cant be hurt.
Its as stupid as Wolverine versus Juggernaut
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he can eat spirits (D i mean) and break spells eating them as well he's just plain very powerful, he has powers greater then that count magnus guy who had a legion of monsters under him and D has more power then that countess who knew his father. but them both up against dark snider :P
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