This is a crossover between Harry Potter and KHR. The first chapters are concentrated mostly on KHR storyline (ring battle will be included but after that I don't know if I go along future arc or will write a own arc) after that the focus will be more on Harry Potter story line.

"Where is he?" screamed an enraged police officer "I don't know" said another one when suddenly everything went black as a curtain fell on them. They heard a mocking laugh which only helped to anger them even more. "Well then gentlemen I very much enjoyed our little play date. I have what I came for. Better luck next time" said a young man while pocketing the night star, an expensive necklace with a dark blue sapphire surrounded by small diamonds and disappearing into the night. "Damn it all" screamed the first officer while crawling out from under the curtain "We will get you. One day we will get you you thrice damned thief"

The young thief appeared to be around seventeen had long violet hair and violet eyes. He wore a high-collared black shirt and black trousers. He wasn't a normal thief but the infamous thief Dark Mousy or better known through his moniker, Phantom Thief Dark.

"It's time to return to italy. Mammon should be able to get several million for this little bauble" He ran into an alley and ten seconds later he slowly walked back into his hotel disguised as an elderly man. Several police cars passed him still searching for him.

2 days later in italy

Dark Mousy currently disguised as a thirty year old man with black hair and blue eyes arrived in Rome. While walking to his car he saw someone that made him smile cruelly. He stopped and began to followed the man to a less crowded area and confronted him.

"Hello long time no see" "Who are you and what do you want" asked the man confused. "Well I guess I can't expect you to remember me but I am clearly remembering you and I have longed to see you again, Ottavio"

The man, now known as Ottavio, paled drastically. Dark Mousy smirked "Did you really think that we will let you get away with what you have done. You should have known better than to betray the Varia you filthy little traitor"

Ottavio regained some of his confidence back and said "You really think that you can kill me. If you remember me you should also remember that I was the second in command and since I can't remember you you must be some pathetic weak underling I never bother to get to know"

"Wrong I am the cloud guardian and the second strongest Varia member. Now Ottavio time to die"

7 hours later in Varia HQ

Dark in his usual appearance (violet hair and eyes) walked through the headquarters into Xanxus office. Inside the office were the other core members of the Varia. First was Xanxus the leader of the Varia , the next was Squalo the rain guardian followed by Mammon the mist guardian, Lussuria the sun guardian, Levi the lightning guardian and Belphegor the storm guardian.

"Dark you are finally back what took you so long we awaited you hours ago. Time is money and I hate wasting money" said Mammon "I am sorry about that but I met an old friend and I couldn't help myself but greet him perhaps you remember him. It was Ottavio" said Dark. Hearing that name only enraged Xanxus "WHAT WHERE IS THAT FILTHY PIECE OF SHIT"

"In several different places. Some of him are in the fountain near the marketplace in Rome, some of him are in the cold storage room of a slaughterhouse and the rest is still in the alley where I killed him at least when no one found him already"

"Good work brat" said Xanxus and laughed. Dark smirked and tossed something to Mammon. He/She/It (no seriously what is his/her gender but since there is a lack of strong females Mammon will be female) caught it and was surprised. "You was actually able to get the night star" she said "Please don't insult my talents. It was actually far easier than some other of my targets"

"You really love to steal things" "If you are complaining about that than give me the night star back and I will return it" said Dark "NOOOO" Mammon nearly screamed and hold it against herself protectively.

"I thought so besides stealing sounds so horrible I prefer the term borrowing it with the sincere intention to never return it" said Dark. Xanxus snorted "Alright brat. The time has come you know what to do right?" "Of course. See you in about a month"

3 days later in Namimori

"Ok listen class" said Nezu Dohachiro the science teacher of Tsuna's class "You get a new classmate. Come in" he shouted the last two words towards the door. The door opened and revealed a boy who stood at about 157cm. He had blood-red hair and ruby eyes and wore the standard school uniform.

He walked in front of the class and bowed "Good morning everyone my name is Daisuke Niwa it is a pleasure to meet all of you" "Niwa-kun please sit down behind Sawada-kun after that everyone will introduce themselves so that you will know who is who" Nezu said while pointing at a brown-haired boy "Hai sensei" Nezu waited until Daisuke sat down and all introduced themselves. "Good. Now let us begin"

During break in the school yard

Tsuna and his friends surrounded Daisuke in order to get to know him "So Daisuke can you tell something about you" asked Takeshi smiling "What do you want to know?" "Where did you come from? Why did you change school? What are your hobbies? You know the usual"

"Lets see. I came from Osaka and I was forced to change school since my guardian has some work to do here. My hobbies hmmm well I like to practice every form of martial arts" "You practice martial arts? YOU ARE EXTREME" screamed Ryohei. "Stop screaming stupid turf top" said Gokudera. "I am sorry to say that Daisuke but you don't look like you practice martial arts. You look rather..." answered Takeshi while trying to find the correct word.

"Yeah yeah I know but you shouldn't underestimate me there is more to me than you can see" said Daisuke. "May I ask a question?" "Go ahead" "Every school has unwritten rules which unwritten school rules has Namimori" "There is actually only one" said Tsuna "NEVER EVER piss

Hibari-san off" "Who is Hibari?"

"He is the Disciplinary Committee Leader and sees everyone as herbivores and uses his tonfas to bite us to death as he called it" answered Takeshi "Ok and how exactly do I avoid being bitten to death?" "Follow the school rules. Don't crowd too much and don't disturb the peace in Namimori"

"He sounds like a lovely guy. What do you guys do for fun?" "We play mafia" answered Takeshi cheerfully. "You play mafia?" asked Daisuke incredulous "Yes Tsuna is our boss and we do all kind of stuff" replied Takeshi immediately "Yes Sawada has an EXTREME baby who is EXTREME"

"What kind of stuff do you do as a mafia" "One time we were on the baseball field and we so ahhh the balls come flying to us and we do chaaa and the balls go whoooooosh KABOOM" explained Takeshi while making different poses to help explain it.

Daisuke looked absolutely confused "Can someone please translate what he just said I didn't understand a single thing" "What the baseball idiot tried to explain is that we modify a few balls so that they will explode so that they will be like bombs" said Gokudera "Sounds like fun can I join" asked Daisuke "Sure the more the merrier" answered Takeshi.

Tsuna was freaking out 'This can't be happening. Now I don't even need Reborn to make my mafia family grow. And when he really practice martial arts Reborn will be probably thrilled that he joined my family. Why me'

"So what are we going to do after school" asked Ryohei "Hopefully something EXTREME" "Herbivores you are disturbing the peace of Namimori" said an annoyed voice behind them, a voice who undeniably belonged to the demon prefect Kyoya Hibari "For that I will bite you all to death" he said and rushed in his tonfas raised.

Several minutes before

Kyoya searched the entire school yard for one purpose only. He heard about a new kid and it was his responsibility to make sure that the kid knew the rules and there is only way to make sure that he will follow the rules. The new kid must be bitten to death.

After some minutes searching he found him surrounded by that annoying group of herbivores with that interesting carnivore baby. He walked towards the group with the intention to bite the new kid to death but then something happened that changed his intention. One of the herbivores screamed and disturbed the peace of Namimori. Now he had no choice but to bite ALL of them to death.

When he arrived at the group he said annoyed "Herbivores you are disturbing the peace of Namimori. For that I will bite you all to death" He raised his tonfas and rushed towards Daisuke.

What happened next surprised everyone Daisuke managed to block Kyoya. Kyoya scowled 'How dare that herbivore stop me from biting him to death' he raised his other tonfa to hit Daisuke but he avoided the hit.

Meanwhile in a tree

Reborn watched the new kid and how he interacted with Tsuna. He was curious about him, he could feel his flame. It was still latent but he has definitely mist flames. With a bit training he could awaken his flames and from the feel of it he had the potential to be a powerful mist.

Reborn scoffed as he heard Daisuke saying he practice martial arts. He didn't believe him since all mist users he met were physically lacking the only exception so far was Mukuro and even he wasn't that great in physical aspects.

He saw Kyoya who had an annoyed expression nearing them 'Now things getting truly interesting'

Reborns own expression change very quick into one of pure glee. That new kid Daisuke was able to match the feared demon prefect in power and skill.

He would deny it for the rest of his life and even for his next life but he squealed. Yes Reborn the infamous hitman squealed. His protege hit a gold mine screw it he hit a diamond mine. He managed to get a powerful mist for his family. A mist with physical abilities normally reserved for suns or clouds and he did it all without his help.

Back with the group

Kyoya annoyance quickly changed into one of joy. That kid wasn't a herbivore like he first thought but he wasn't a carnivore either 'yet' he added as an afterthought. Kyoya managed to overpower Daisuke and get a good hit which threw Daisuke to the ground "Never disturb the peace again or I will bite you to death omnivore" said Kyoya and walked away.

Tsuna and the others gaped. "Wow you didn't lie when you said there is more about you than what we can see" said Takeshi "Indeed" replied Daisuke and smiled. Tsuna sighed and paled as he saw Reborn in the tree 'OH crap Reborn saw everything. There is NO WAY that he let Daisuke go now. WHY ME' he screamed internally.