Hey guys! It's-a me, Gundam Kaiser, with yet another new crossover! Specifically, gonna cross Harry Potter and JoJo's Bizarre Adventure. Now, I got the idea for this from another fic where Harry was a vampire and was more-or-less-evil-but-not-really . It was... less than fun. So I thought I'd put my own spin on that general premise.

Prelude

The young Harry Potter was excited. He was getting to go to the zoo! ... for his cousin's birthday, but still! He never, ever got to go anywhere! ... that he could remember.

Being cooped up in the cupboard with sporadic eating habits made his memory rather fuzzy on the details.

With a look of determination that anyone aside from the Dursleys would've found adorable, Harry resolved that he was going to do his absolute best to be quiet, not embarrass his aunt and uncle, and hopefully not be on the receiving end of a swirly.

Almost immediately after arriving at the zoo, Harry was abandoned by his aunt, uncle, and cousin, which initially worried him a little - getting back to the car in a timely fashion would be more difficult if he didn't have a cue to go on - but he decided he'd just make the best of things. Even if he was locked up in the cupboard for a month, having seen all those cool animals would be totally worth it.

At that time, he bumped into a suspicious-looking guy in a very conspicuous trench coat and fedora, muttering something to the effect of "Won't let that damn Kujo get me...!" The man appeared to be in quite the frantic hurry, and on bumping into Harry, dropped a creepy-looking mask of stone.

Being a sweet and innocent young lad, Harry attempted to return the stone mask to the man, but he was already gone.

Later that very evening, at Number 4 Privet Drive, the mask had come out, and of course, there was yelling. Dudley got upset that Harry had a souvenir that he didn't, and, naturally took it from Harry and tried to put it on himself.

However, Dudley immediately decided against that when the stone was a bit rougher on his baby-smooth face than he would've liked, and in an act of spite, forcibly smashed it onto Harry's face when the smaller boy asked for it back.

The impact was enough to break Harry's nose, and thus start leaking blood.

Blood, which triggered the mysterious properties of the mask, causing several spines to emerge and impale young Harry's brain!

Harry Potter fell to the ground, letting out only a faint whimper of pain.

On seeing this, the adult Dursleys were furious. Vernon ranted against Harry for having the gall to die in their living room and swore off paying the funeral expenses, while Petunia attempted to move Harry out back immediately, before his corpse could begin stinking up the room.

No sooner had she taken hold of him, however, than a burst of malevolent energy pulsed from Harry's body, and he appeared to be covered in a sickening white light.

Before anyone could comment on the bizarre phenomenon, Harry quickly raised his arm and gripped Petunia around the neck! In desperate terror, she attempted to remove his hand, but could do nothing - not only did the young hand completely refuse to budge, but she kept growing weaker. And that was when she realized that Harry's small fingers were not just wrapped around her neck, but had pierced her skin, and begun draining the blood from her body!

Vernon and Dudley could do nothing but watch, paralyzed by complete and utter terror. In but a moment, Petunia Dursley had been reduced to a withered husk.

Harry then rose to his feet, and slowly removed the stone mask. The capillaries in his eyes had enlarged, and his complexion had paled slightly. He also appeared taller and of healthier build, as if taking Petunia's blood had undone his malnutrition or aged him slightly.

Harry then opened his mouth, revealing that his canines had become extremely pointy, and then let out a hellish screech, a sound that no human could ever produce.

"Wrryyyyyy!"

Harry leaped at his uncle, and with one swipe of his hand, completely severed his head and sent it flying into the wall with a brutal crack. Vernon Dudley's headless body flopped to the ground, occasionally wracked by spasms that would grow less frequent over the course of a minute or two.

Slowly, Harry licked the gore from his fingers, shivering in a moment of pleasure. He hungered for more! For more blood! And he wondered: if even the blood of pigs like his aunt and uncle set his soul ablaze, then would a better class of human being taste better as well?

At that moment, Harry heard the doorknob turn, and was reminded of Dudley. Rather than let the last of his tormentors escape, Harry instead grabbed his cousin by the shoulder and said, "If you're so interested in the mask, then I see no reason you can't take it with you!"

The small vampire smashed Dudley's face into the stone mask, the new spray of blood causing the spines to re-emerge and impale Dudley's brain as well. However, Harry then kicked Dudley out of the house, and into the evening's fading sunlight.

There was a moment of perfect stillness, as the mask worked its mysterious power over Dudley.

And then, that stillness came to an abrupt end, shattered by Dudley's agonized screams as he burned alive in the failing sunlight.

As the sun set on that day, so too did it set on the young life of Dudley Dursley.

Having observed his cousin's demise, Harry shut the door and then hid in the cupboard under the stairs until he could be sure that the sun was well and truly down, before then going out to retrieve his mask.

"So, it works somewhat like that Dracula film I saw at Mrs. Figg's house..."

So, what do you think?