Hello! So this was a story I had rattling in my mind a few months back when I was reading Reborn stories and reliezed something. All of these think the Mafia is a simple game that one can balance with an innocent life. So, I'm fixing that with a Harry Potter/Reborn crossover, because... while Tsuna's a good character in my mind, if not advanced as he should have been, he'd be eaten by real world crime syndicates. Also I love Harry potter crosses as y'all know. So I hope you enjoy this story.

Chapter 1 - Potter's Fall

"Potter," A voice purred out for the newly departed soul to hear. The being shifted around and looked to the side, away from where his eyes were lingering on the dead body at his feet. A body that looked just like him. "So kind of you to join me," the voice continued, the man seeing it belonged to a gorgeous woman with long raven black hair.

"Yeah…" He said as his eyes returned to the dead body in the middle of the battlefield, a black necrotic infection clear over his chest. "Nice to see you, Hel. How have you been since I last visited?"

She didn't respond for a moment. Harry glanced over and saw a frown on her lips as she was looking at the devastation around. "Pissed mostly. I still can't believe you got turned into a vampire. A being that should be underneath me, my master," she huffed with arms crossed over her bare chest.

"Again, sorry," Harry said without much care. "Hopefully, fourth time's the charm with me," he joked as he started wandering around the field full of dead beings. Werewolves, wizards, and vampires dead everywhere from the final battle of the wizarding war of two thousand twenty-three, a mere twenty-six years after the death of Voldemort. The wizarding world's genocide against all dark creatures.

He, of course, was fighting for the vampire side due to his status as reigning king of the northeastern hemisphere. Shame he had to have died at the hands of his own backstabbing envious general, but that was the cost of dealing with old bitter vampires. Harry, at least a little bit, understood why the wizards would want vampires dead. A good fourth were utter bastards, most of the magical ones really. The muggle vampires were, if found and helped, mostly pleasant folks that went through an official supply line for some synthetic blood.

The forty year old king took in the sight of his general's headless body under a wizard's dead body. 'At least he had died too.'

"Alas, no. I do have to punish you, master," Hel purred out, her smooth cheek pressing against Harry's own beard-covered one as she hugged him from the back. "See, your soul is tainted by the vampire curse, so… you'll need to go through a cleansing process that I have to sometimes do with my masters when they…" Her hugging arms tightened around the soul's midsection painfully even if Harry didn't show the pain. "Fuck up royally!"

"And what does that entail, Hel," He asked, barely keeping the wheeze from his voice. He might not need air to survive, but talking, even as a soul, was a different matter.

Her grip loosened and returned to being gentle. "Partial reincarnation." Harry glanced over at the raven-haired goddess with a raised brow. "I put you in a fresh dead body, resurrect it with enough healing magic that even a broken neck would be fix with no signs in a few days, and you live the life until death. The curse will be gone and you will pass on."

A groan escaped Harry's lips as he rubbed his face, Hel relishing in the annoyance he felt. "Man," he groaned.

"And!" Hel continued, seeming gleeful. "Since you did something as stupid as drinking the blood of other vampires to gain more power AND become a vampire king! I'll be putting all your scars on the new body as well, over time of course." Harry forgot how petty Hel could be when angry.

"Fine," Harry sighed out. "Though, how will this keep me from just returning after a while and resuming my control over vampires?" He asked, curious.

"Well, I'll be putting you in a dimension without dark creatures and the magic you know. Course you'll have some due to it being part of your soul, but it won't be passed through blood. It's the realm I use mostly for cleansing," Hel explained as she untangled herself from Harry and stepped back.

She stepped around the former king and stood in front of him, hip cocked and arms crossed. "You'll be taking control of a boy by the name of Tsunayoshi. He will have died from a terrible infection. Horrible suffering, but he's in a better place now. That's all you need to know. The boy's mind will be there for you to assimilate on your arrive, so you'll find out what he knows."

Harry gave a slow nod as he rubbed his phantom pains from his chest wound. It had been a nasty gash to begin with, so it still kind of hurt. "Then, I guess I'll be talking to you when I die… a fifth time."

"Yes," Hel sighed out. "A fifth time." She stepped forward and gave Harry a peck on the lips, not surprising the man at all. "Do try to not die too fast like you did the first time with your life. The cleansing takes a few years."

Harry nodded and Hel placed a hand on his forehead. In a white light, the soul disappeared from the battlefield.

Harry blinked his eyes open and immediately groaned. His hand, a small dainty thing, grabbed at his t-shirt covered stomach. "Oww," he moaned in his new small voice. 'Hel was right. This kid did suffer in death, this fucking hurts!' His hand clenching at his stomach.

The man now in a child's body, slowly sat up, feeling horrible. Little Tsuna passed away from a terrible internal infection from what Harry figured to be appendicitis just as Hel said. From the boy's mind, Harry learned that Tsuna didn't want to burden his mother, so bore it with a grin for over a week before he finally passed in bed after getting struck by a bully in the stomach, agitating the infected area.

The now ten year old child slowly sat up, already missing his old body's pain tolerance. There was a mental aspect, but his old body had nearly twenty years of frontline war against the most dangerous beings in the world followed by what was going on a decade of ruling over the most traitorous people to have walked the earth, while this one had the occasional beating from a bully. It was no comparison.

The former king spun his small weak, white legs over the side of his death bed. Tsuna, an Italian-blooded boy born in Japan. A loser to everyone, including his mother. If anyone had cared enough, would have found he would have been diagnosed with clinical depression, had it since he was the tender age of seven. The boy was good at hiding it however, even if someone was looking, they'd find it a bit hard to see all the signs.

Harry pushed himself up on unsteady legs and slowly hobbled over to the child's wardrobe, grabbing his school uniform for the day. The former vampire's mind was far sharper than it had been when he took the throne as a military general, so he already had Tsuna's short life sorted out with all the knowledge the boy knew.

Everyone called him a loser, but alongside depression, the young boy had two other mental disorders. ADD and severe anxiety disorder. He nearly shut down the moment someone started a conflict with him, cowering from whoever, even if it was just his mother telling him to get better grades, added on he had trouble paying attention to anything he didn't like. Even with this, the boy wasn't stupid, he knew the test materials when he buckled down to work on it, he just got scared of the test and knew he'd just fail, so he hardly tried.

Harry pitied the boy a bit, but banished that thought. He was in Hel's realm and seeing as he was just an innocent child that went out of his way sometimes to help little animals, he'd be fine with the goddess of death.

Hobbling with a hand on his slightly swollen stomach, he entered the shower and cleaned up for the day. Washing his long, barely kept hair, the boy noted that the hair went down to the middle of his shoulder blades, Tsuna never caring about his image. It use to puff up, but the length weighed it down too much.

The king checked over the lad's body to find multiple bruises, a massive one on his stomach, and many little scars from his clumsy nature and the few times older bullies slashed him with knives or sharp rocks. The child's face twisted into a frown at the sight of the scars, but looked up to finish washing his hair. He wasn't one to talk and if what Hel told him was true, which it was going to be, he'd be getting his old body of scars back slowly.

Of course, this was a punishment for becoming a creature of unlife, so he wouldn't be getting his strength or abilities back sadly, but not that he minded too much. The boy's magic levels were that of a first year, though dormant, but there thanks to his soul in the body. Harry or as he was now, Tsunayoshi, was confident he'd be slinging out war spells within a decade.

He'd be slinging magic and... could go out in the sunlight again, so… all around, he didn't mind the loss of power. Blood was never an issue for the soldier in him, more of an bland meal, but the painful sunlight reaction pissed him off. He might not have wanted to be a vampire, but he made the best of it, but losing the sun made him a spiteful man for a while. Tsuna believed that was the spite that started his rebellious ideas.

Tsuna scrubbed his head a few more times and walked out of the shower, drying off, careful about shifting his body. He stopped in front of the mirror and frowned at what he saw. 'When I'm healed, I will need to start working again. A king should never be this weak.'

The child pulled on his uniform and slowly hobbled out of the bathroom and back into his room. A glance at the clock showed he had ten minutes to get to school. His frown back on his face, one of his trademark expressions during Potter's reign over the undead people, Tsuna grabbed his bag and walked down the stairs one at a time, each jarring sending fire through his blood.

His normally hazel eyes slowly bled into a deep maroon color as he walked out the door, his soul was no longer the soft hazel the child's was and it showed in the nearly bloody nature of the eyes. Tsuna slowly pulled out the boy's music player and put the earbuds in, canceling out the world around him as he walked with pained steps through the streets of the town. The pain didn't stop him from enjoying the light on his flesh, even if it wasn't 'his' body, for the first time in so many years. So as he walked, he lost himself in the warmth on his skin and the music in his ears.

Music, one of the only escapes Potter had near the end of his life. When everything was trying to kill him, thinking he was weakened by the rebellion, when his own subjects were attempting to usurp him for their own meaningless power plays unlike his want to free the vampires under the tyranny of the last king who had ruled for two centuries too long, his music was the only thing he could enjoy that wouldn't kill him. Food could be poisoned, television could have bombs planted inside, books could have strips of poison, but music was auditory which a vampire couldn't spike with something lethal.

The child's taste in music wasn't too great though, but Tsuna planned to fix that that night. He had to take it easy, so spending the night checking up and stealing music felt like a fine thing to do. His head slowly bobbed as he walked with his frown still in place, eyes unwavering as he thought to himself. 'I can't change too much. Tsuna's classmates would rebel and with the teachers not caring, I would be brutally beaten by the bullies for being more weird. So I will have to act weak… until I show them what a real king looked like.' His frown deepened into a scowl for a second before a nervous expression erased it from existence.

His sure steps began to falter a bit as the child let the pain of each step show, now holding his stomach as he walked and looking pale. In the distance, he heard the bell for his elementary school ring and he knew what awaited him at the gate. A bastard child that reveled in violence.

Tsuna couldn't help but think as he faked a wince expertly, 'Boy would make an excellent vampire soldier. Terrible leader though. Temper would be too volatile. Worse than mine was as a boy.' From one who, in his teens, beat a death eater to death for merely looking at his best friend in a fight, that was a horrifying thought. His music player was put away as the school came into sight.

The injured boy stumbled into the school yard, suppressing a hard cough as he fought back vomiting. The infection was still there after all and if it wasn't for the soul's ability to control the body to such an extent, he'd have never made it out of bed. Sniffing back the tears the coughing fit caused, Tsuna saw a tonfa heading towards his head.

The boy wanted to duck, but his body was weak and slow, so he caught it fully in the temple, knocking him to the hard asphalt-covered ground with a sharp cry of pain. The child grabbed his now bleeding forehead and curled up with a whimper, sniffing as no child would have resisted the urge to cry for a blow like that. "You're late, herbivore," a sadist young voice sneered.

All that was replied was a hard sniff as the curled up figure's shoulders shook as Tsuna forced himself to cry. It was a bit hard for the king to show such weakness, but he was a master at acting, so he did so anyways. Since the little bastard born didn't hear what he wanted, he gave a kick into the boy's bruised stomach, inciting a very real scream of pain. "I'm sorry," he whimpered out as he fought for his breath, red flashing in front of his eyes from the agony. "I had trouble walking here," he said in a pained voice.

Another kick hit his stomach, forcing the boy to curl up deeper and cry harder, a bit easier thanks to the pain that would have made a soldier vomit from. "No excuses, herbivore!" The boy sneered out. "Or I'll bite you to death!" Tsuna didn't move as he tried to catch his breath, coughing with every other inhale. The boy gave a kick, thankfully into the side of the boy's covered head, before stalking away.

Tsuna, now in a great deal of pain, the like that while no where close to a cruciatus curse, was probably the closest to the most pain he had been in since becoming king. Struggling for air, Tsuna knew he couldn't just lay on the pavement for the day. His feet slowly curled under him as he tried to get up, only for vertigo to grab his eyes and he fell back onto his stomach, white flashing in front of his eyes.

'I'm hurt. Bad,' Tsuna grudgingly acknowledged as he tried to get up once more. His arms shook, but he got onto his hands and knees this time. Breathing in short bursts, he sucked in air with one breath and forced himself to stand.

The small amount of air in his lungs burst forth in a cry out in agony, barely stopping it from being a scream. The job was done and the boy was on his feet once more, unsteady as they were. White and red flashed in his dark eyes as he stumbled towards the school building, sweat starting to drip down his face as the child gritted his teeth from the pain.

He pushed open the building and made his way, not to his class, but to the nurse. He needed a hospital, that much the boy knew. That kind of pain did not go untreated. He'd been shot through and through by a fifty caliber rifle for less pain than what he had just experienced. The head injury that now coated his face with blood was an afterthought.

The boy found his way to the nurse, starting to get light-headed, forcing him to rapidly blink as he tried to stay awake. He pushed open the door and looked around, only to find the nurse was out for some reason. Tsuna groaned as he went over to the nurse's desk and grabbed the first aid kit.

The tin flicked up with a squeak and Tsuna grabbed some gauze and dressing. Supplies in hand, Tsuna stumbled over to one of the beds and sunk down on it, pressing the dressing into the wound on his eyebrow. A glance at the window showed the steel weapon had busted a vertical line from his left eyebrow to the middle of his temple.

The wound would need stitches too, causing the man in the child's body to growl. The dressing firmly on the wound, Tsuna quickly wrapped his head expertly before laying down on the bed. He knew not to go to sleep as the hit without a doubt caused a concussion.

So, he pulled back out his music player and put the buds in his ears, cranking up the volume to a level that would help him stay awake, but still hear the world outside of the music as he stared blankly up at the ceiling.

Minutes slowly passed as the boy waited for the nurse to arrive so that he could be treated and then have an ambulance called for him. Finally, the nurse walked in with a clipboard in hand, muttering down at it with an intense look. Tsuna, noticing the nurse's arrive, gave a hard cough. The nurse, a plump man, jumped and dropped his clipboard.

His eyes landed on the upset looking bloody child now sitting in one of his beds, his head bandaged up with already soaked dressing and gauze. "Shit," He cursed as he walked over, mindless he just cussed in front of a small child. "What happened?"

Tsuna sniffed and rubbed his eyes as he answered, "I… I was late t-today. My stomach r-really hurt and it hurt to walk." He placed a light hand on his stomach where his appendix had burst. "Then that guy with the weird hair hit me with… umm… a pipe?" He sniffed as he forced his eyes to well up. "Then he kept kicking me in my stomach and it really hurt!" He whined as he continued to hold his stomach. "It really hurts!" He repeated to the nurse to make sure he fully understood that was the real problem, not the head wound.

"Lift your shirt please," the nurse lightly ordered as he took a knee next to the bed. Tsuna did so and the nurse gave a sharp inhale. "Are those bruises new?"

Tsuna made a show of trying to look over his shirt and stared at the bruises. "The… stomach one was there when I woke up. The others are from me falling down stairs… But the stomach one was smaller," he whimpered out, mentally groaning at the pain of moving his body to look down.

The nurse nodded and jogged over to his desk. He picked up the phone and dialed a short number. "Yes… Hello. I need an ambulance at Namimori Elementary school. One of the students is injured." The man stayed on the phone for a few more moments before hanging up, turning back to Tsuna. "Can you tell me your home's phone number? I'm sure your mom will want to know what happened," he said kindly to the trembling boy.

Tsuna quickly gave his home number and the man called up Tsuna's mother, Nana. Tsuna just put his earbuds back in and started to meditate on the music as he distanced himself from the pain. He didn't go so far as to lose touch with the world, simply his body and time.

The EMTs eventually arrived and took him out on a wheelchair to the medical vehicle, hauling him to the hospital nearby. The doctors quickly took him in and checked him over, asking questions like how long he had the bruising, four days, how bad was it, bad, and many other inquiries.

He was put under and when he woke up, he found himself even weaker than before, now in a hospital bed staring up at the white ceiling, a color of white he so hated. When he tried to sit up, he found he didn't even have the strength for that.

The boy gave a groan as he relaxed down. He did notice something. The pain was gone, and not from drugs gone. It felt like he had healed up, but if that was the case, then Tsuna knew he had been out for days if the magic had done its job. He looked around and saw an IV drip in his arm and a glance down showed a stitched up cut in his side, so they must have operated on him.

Knowing he was weak, the boy didn't fight the lure of sleep.

Tsuna left the hospital on his own power two days later, the seventh day he was inside the building for burst appendix and head trauma. His left eyebrow was now split vertically with a few centimeter long soon to be scar from the damage inflicted on him, not that the boy cared. He denied plastic surgery as he didn't care about scars.

The pain was completely gone from his magical after-death healing by the time he entered his house with his mother fretting over him. He just gave her a small smile and walked up to his room to go relax for the rest of the day. Tomorrow he was going to start his training after all. A dark look crossed his face as his door shut. 'In time, I'll teach them all to never strike a king,' he thought as he booted up his laptop, connecting his music player to it.

First he made a training schedule. Tomorrow would test his abilities and endurance. Depending on the results, he'll increase or lower the sets and reps he would need to do then the kilometers he'd be running a day. A man who couldn't chase down his goal was useless after all.

Secondly, he checked the music scene to find it was back to the date it was when he died. He apparently resurrected much earlier than when he died, so he found his favorite artists from his mercenary days and shamelessly ripped the music from the internet into his player. What was pirating music when one literally brought a kingdom to its knees and sparked a genocide?

Thirdly, Tsuna cleaned up half his room, careful not to pull something to keep his stitches safe, so he had room to exercise. By the time the boy was done, he was ready to sleep off the day. The next morning, he woke up a bit sore, but it was a pain he easily bore.

Clean, he went downstairs, flipping on the needed lights and started breakfast off of habit. He was a king, but cooking was always a passion of his. Plus he was a vampire king, so most of his staff knew dick about cooking and those that did, well… he did die from poison after all. If he hadn't cooked his food, it would have been much sooner and off the battlefield.

His taste for that day was of Italian food, so that was the breakfast he prepared in that fashion, but seeing as he was born and bred in England, Tsuna added far more to the meal. Some ham, mushrooms, a dash of eggs, the works.

When he was done, he set the food on two plates and covered one in aluminum foil before beginning to eat his fill. It was only six in the morning and Nana would still be asleep until seven. When he finished his meal, he walked out in the bitter air and started jogging.

It didn't take long for the child to reach his limit which was ten minutes of a light run. Frowning, Tsuna immediately adjusted his plans as he forced his body to continue so he could get home for a shower before school.

When he was cleaned up, it was twenty minutes before seven and an hour before he needed to be at school. That in mind, he dressed for the day and walked outside to get a head start with getting to school, head downcast as he trotted along on sore legs with his music in his ears.

His lips mumbled the Russian lyrics as he walked through the empty street, but that was all that could be heard from the ten year old. If anyone spoke Russian, they'd be shocked at how violent the lyrics were, but being in a suburban part of Japan, that was unlikely.

His footsteps quickly went across the elementary school's threshold and he continued to slowly walk up to the building and entered, heading up to his class slowly, eyes still on the ground in front of him. He found his homeroom and walked in, seeing it was empty of all life, he took his normal seat and continued to listen to his music with dead eyes, thoughts on nothing.

The king noted when people started arriving and gossiping about him, but Tsuna didn't show any sign of him hearing them over his music. When the teacher arrived, he didn't bother taking his earbuds out and the teacher didn't care enough to force him to.

The school day passed slowly for the action-oriented soul and by the time it the bell rung, he was striding with long steps out of the room with everyone following his example. He skillfully slipped through the halls, not bumping into anyone and managed to not draw any attention to himself.

That was the beginning of his life as Tsuna.