Sup readers, and welcome to another derpfic of mine. This time it will be OC in Katekyo Hitman Reborn series, i admit i love the anime on first time but after entering the future arc filters i quit watching because its damn boring, i love the anime for being parody and involve in Mafia realistic...but its always broken. So the way i write will change according to my own plot. Oh btw about my first derpfic Megaman Zero: God Gundam i know i haven't update or post new chapter because i'm busy with my work, i done 2 chapters so far and i plan to post it in one shot when i finish and do some corrections to improve. Anyway thanks for reading mine so far, i would hope to see any reviews or comment from you readers later.

Shall i add this? the disclaimer thing? Everyone knows i didn't own anything except my OC.

Chapter 1 :Killer Rabbit

Late night, somewhere in Italy.

"Haah, haah, haah." a lone man seen running along the alleyway, knocking out several trash can on his run causing him to lose balance and fall to the ground. He rolled few times, catching his breath for long distant run, he was running for his life, someone wants him dead. The man got up to his feet wiping the sweat from his forehead and he can heard a music playing that normally heard from theme park or some amusement park. The man shriek in fear when he heard the music is getting closer, he keep backing off facing the direction where the music come from until his back meet the wall. He look around for a way to run but suddenly his expression turned into total horror as the music and footsteps is getting closer and closer from the shadow in front of him.

Later, a figure was revealed slowly from the shadows, it was a rabbit mascot which normally saw in the amusement park, but it was not the cute kind. The face of the rabbit shows grim feeling with that sharp shape eyes flashing yellow light and the mouth reveals sharp fangs like the pumpkin face and a zipper on his body decoration for Halloween but much creepier with a stain of red on it.

The man shout in fear as he reach for the gun in his suit, he pulled out and fire several rounds on it. The rabbit person flinch by the gun shot and he bend backwards after the last shot made by the man, the man now breaking more sweat as the rabbit stood still, eyes flashing yellow as he reach to the side pocket and pulled out several throwing knifes and throw towards man hands, stab into the wall along with it. He scream in pain and the the bunny suit guy move closer to him.

The man look at the bunny mascot with fear as the face move closer, "Stay away from me! Do you know who you're fucking with?!" He said in fear while the bunny mascot just stay silence. "I'm a Mafia from Colrado Familia! You and you're family will be in trouble if something happen to me!" The man threatens him and the bunny mascot suddenly chuckles from it and reach his pocket, he took out something and reveals a ring and a pocket watch which seem covered by blood. The mafia look at it and widen his eye in fear, "T-t-t-that's the boss ring and pocket watch! You bastard what you do to him?! How you get it?!"

The bunny mascot just laugh, the sound of the laugh shivers him to no end as it was like the laughter of death, the mascot face move closer to the mafia and spoke, "Dead, all you're friends and you're fatso boss are dead! Died by my hands, this very own hands!" the bunny mascot laugh while the mafia just stand lifelessly, all his friends and his boss were killed by this crazy mascot which seem like a lunatic murderer. "Now then, how should i kill you?" The bunny mascot tilt his head thinking of ways to kill him.

"Ah...i know!" He reach out for his body zip on his torso, "How about i shred you with this?" pulls out a chainsaw, "or shall i snip you with this?" pulls out a giant bolt cutter. "Now...take your pick, it's free of charge..." He laugh after that while the poor mafia is terrified beyond belief, his sweat drop like rain, his nose dripping, saliva's drooling, his legs are shaking and he wet himself as a result. "Please! Please don't kill me! I have a wife and a kid! Please!"

The bunny mascot just laugh at it when he saw the Mafia wet himself, "Oh, now that's refreshing! I love seeing poor Mafia's being pathetic when they are about to get killed, but let me ask you this...Do you show mercy on people you point gun too, hm?", the bunny end the sentence with grim tone, "Never! I saw in your eye's, laughing at those victim you killed and pull the trigger because you being amuse of how you control them! All those who you killed said the same thing and what you do? You KILLED THEM! Now why shall i spare you while you're not?!"

"Please i tell you, I heard the Vongola Family is having a tournament or something like a battle for successor, i heard future Vongola Decimo is in Japan somewhere call Namimori, PLEASE SPARE ME!.

The rabbit just chuckle.

"Now then, i heard something really interesting, thank you for info, now you may die."

Before the Mafia say anything, he only scream in terror as the rabbit use his giant bolt cutter and killed him, the rabbit just laugh at his work.

"Heheheh, this is going to be interesting...I wonder what will happen if I kill the Vongola successor...HAHAHAHAHAHAHAH!"

Killer Rabbit continue to laugh at the idea of crushing the most powerful Mafia in existence, it brings him shiver's thinking how the world will react when he kill the Decimo successor, he noticed someone is watching him from other building, he turn his gaze on the location, saw someone holding a sniper rifle, laying down aiming at him.

The sniper fired on him hitting his face, Killer Rabbit bend his back because of it. The sniper sigh a relief closing his eye's of finally hitting his target, but when he open his eye's he saw Killer Rabbit crouching in front of him.

"Boo!"

The sniper shriek in fear and crawl backwards in fear, knowing his reputation the sniper will die. Killer Rabbit laugh at it, "What's wrong? Thought I was dead by cheap shot?" Killer Rabbit laugh again.

"h-h-how you still alive!"

*chuckles* "Let's just say the bullet hit my mouth instead of my head!" Killer Rabbit point his finger at his mouth and a glint reveals that he is biting the bullet, he spits out the bullet and drop it on the ground. The sniper shriek in fear.

"Hahahhah, don't worry I won't kill you, I want you to deliver a message...I know you're from Vongola, don't ask why, it's a secret."

"I'm going to Japan."

Next week later, In Namimori.

In a town where peaceful morning shines towards the it, everyday is a simple ordinary day which normally bird greet the morning sun with their chirping sound but these particular town had it different way.

BOOOOOM!

Yup, explosions heard especially in sawada's Residence house, where you can heard gunshots, screams, explosions and also crying which occurs everyday. Even the neighbours didn't bother with it, maybe because Reborn threatens them if any of them make police report there will be blood.

"cough cough cough! REBORN!" a teenager with brown spiky hair shout in anger. "What Dame-Tsuna?" a Baby in black suit with fedora hat appear from the smoke and smirk at him. "Are you trying to kill me? I was sleeping nicely and having a nice dream!" Tsuna brush off the smoke on his pajamas and Reborn just smirk at it and later pout in creepy way, "But-but you won't wake up even if i call you."

"Don't give me that face!" Tsuna veins pop, "And it's weekend! Why can't i have my sleep peacefully!"he sigh at his life, knowing he will be future Mafia boss, being tutored or more specifically tortured by a baby Spartan, have a friends who also been involved into Mafias and now he have a stupid Mafia tournament which determine which candidate is suitable for the Vongola Rings, everything is mess up.

"Dame-Tsuna, don't forget tonights battle, you will be fighting Zanxus and..." Reborn halt his words when a beetle fly towards him and landed on his face, Tsuna creep at the scene and head off to washroom to refresh himself. In Tsuna's room where Reborn currently receive information from his beetle scouts and his expression turn dark and worry, "So he finally arrive tonight...i hope things going smoothly, ii better call some help just in case."

Reborn dial a number on his cell phone and awaiting call, "Hello, Collonello tonight you're coming to Tsuna's battle or i told Lal Mirch that you collections of her photos in the shower, its emergency." Reborn shut off his dial before Collonello reply to him and dial another number again, "Hello, Dino. I need you and your men on standby Tsuna's battle tonight, its emergency." With that he shut his phone and saw Tsuna enter's the room.

Tsuna start changing his clothes ignoring Reborn's presence in the room, after he finish Tsuna can't help but feel something is wrong with Reborn and he fell something wil happen tonight, he turn to Reborn " Reborn, is something wrong?" he asked.

Reborn snap out of his thoughts and stare at Tsuna for a while and deliver a flying kick to his stomach, Tsuna clutch his stomach in pain and hiss angrily at Reborn, "ouch ouch...what was that for?" Reborn smirk at him "For being a Dame, you're 100 years to early to worry about me, now get going and warm up, you have a battle tonight." with that Tsuna heading for school, Reborn watch Tsuna from the window and look at the sky.

"So, he's destroyed Colrado Familia and heard he's going after Tsuna...tonight is going to be grim

In Namimori Middle School, Late night.

After Tsuna in hyper dying will mode uses the secret technique Zero Point Breakthrough used by the Vongolo Primo on Xanxus and begin froze his entire body up, however Xansus broke free from the frozen states and knock Tsuna away, taking his Vongola Sky ring on him but Xanxus caugh up blood as the ring begin to slip off on its own.

Everyone was surprise over the scene and it was known that Xanxus is an orphan taken by Vongola Nono himself as godson, Reborn and the others quickly on their stance as Xanxus giving orders to kill Tsuna and the rest, as they begin to clash they heard a music played somewhere at their location.

"Wtf? Who played stupid music in this night?" Gokudera asked with frown as he readies his dynamite on the Varia's, "hahaha, that music reminds me of my childhood." Yamamoto just laugh at it while Gokudera smack his head. "Baseball freak! Get serious dammit!"

Collonello, Lal Mirch, Dino and his men all wondering who play such childish music in middle of the night? But more importantly who will enter school ground in this hour? "Boss? What is it?" one of Dino's man asked noticing their Boss expression gone dark and looking ready to kill, they never seen Dino this serious before.

"Kora! Which baby play this? I gonna kick him good!" Collonello wanted to find the source but was stop by Reborn using Leon transform as frying pan and smack his face, "Ouch! Reborn wtf was that for?!" Collonello then being stomped by Lal Mirch causing Collonello to yelp in pain. "Ouch,ouch! Dammit what the hell? What i done to deserve this? What the hell is wrong with you guys?!" Collonello asked angrily because of hitting him and notice Reborn ready his gun and Lal Mirch readies her rifle, Collonello look at them with confuse look, "Errr...guys? What's wrong man, you guys seem like wanna kill someone, come on its just Varia's they not that troublesome for you guys to get serious?"

"Don't be stupid Collonello! It's not the Varia!" Lal Mirch said.

"Huh? Then what?" Collonello asked with confusion, he seriously thought something is wrong here or them.

"It's the music." Reborn said

"Music? You mean the music played suddenly? What so special about it?" Collonello asked.

"You seriously don't remember? I thought you heard it before." Reborn said.

Collonello closed his eyes for a moment, trying to figure out what they mean and remember the music. Then suddenly his eye's open quickly and stand up, "No way! No freaking way! Don't tell me-" Collonello can't finish his sentence as fear begin to shown little on his expression, both Reborn and Lal Mirch nodded their head, Collonello groan in annoyance, "Argh! Of all the time, why he has to be here now?!" Collonello scathing his head in annoyance.

Then a laughter suddenly echoed around them, The Varia's men begin to panic, Tsuna's gang had their guard up, Reborn and others including Dino's men taking up arms as they heard footsteps getting closer, the sound of it is like a step of the Death itself.

"Someone's coming." Tsuna sensing something very dreadful is heading his way, his intuition saying he should avoid it but another intuition is that he needs face it, Tsuna seem confused himself but ever since early morning he notice something will happen today and it seem like this is the moment his intuition was talking about. Tsuna heard clapping as bit by bit it reveals the intruder and the voice of it sending chills to everyone's spine.

"Well~well~well...who would thought there's this kind of party when i arrive, *chuckle* i should have come early oh but it won't be a surprise won't it?" The mysterious figure stand in the shadows reveals it yellow eye's causing some of them jumped at it, even some also drop their legs.

"Hahahahah! What's wrong? Does my voice scaaarryy enough for Halloween? I'm soo flattered, HAHAHAHAH!"

"Stfu and show yourself you freak!" Xanxus shout and shot his flame towards it and explode the area causing massive smoke happen.

"Ushishishi, he's dead by now..." Belphegor walk towards the area where Xanxus attacks to inspect what he believed will be corpse and suddenly Belphegor's face been grab by someone hands, he tried to release the grip but it's strength is inhuman. Then a face is reveal close to him causing Belphegor surprise, it was a face of some bunny suits on mascot, Belphegor only stare at it with wide eye's and speechless.

"Surprise~~sucker!" The bunny mascot laugh like a demon and throw Belphegor with great force towards the Leviathan but was pushed together towards Lussuria, Lussuria manage to hold them but was budge behind with some distance. Everyone in the scene was dumbfound or mouth gap of what happen just now.

"Hmm~~that was some crazy strength~wonder what man do this? It brings me shivers!" Lussuria said in *you know way*

"Ugh...dammit what was that just now?" Leviathan shook his head from the impact and saw Belphegor muttering something beside him on the floor, "Hm? you said something Bel?". Again Levi can only heard muttering and stuttering like he seen a ghost, he lean closer to Bel and trying to hear what he said, however 2 words causing him to stand up quickly and terrified, "What!?"

"Voi! What's wrong?" Squalo asked

"I-i-i-i-i-its-" Levi start stuttering in fear just like Belphegor

"Well what was it?" Marmon asked

"I-i-i-i-ts-"

"VOI SAY IT CLEARLY OR I SLICE YOUR TONGUE!"Squalo said even though he's in wheelchair because of his early fight but he still able to cut someone up.

"ITS-"

"SAY IT YOU DAMN THRASH!" Xanxus finally snap, aiming his gun at Levi, Levi close his eyes ans shout.

"ITS KILLER RABBIT!" Levi shouted.

Jang jang~~ well that's that my first attempt, i don't know if its any good though. Since there's OC like kind of normal so i was trying to make an unusual OC that may never or maybe there is I just don't know, anyway i can't think of any coller or better name for Killer Rabbit as code name.

oh btw this maybe involve boy love if i feel like it. yep since this anime is so famous with yaoi stuff. I may put this OC x Tsuna or may include multi pairing if i fell like it.

Anyway for next chapter will reveal who is Killer Rabbit and its origin is, hint though it involve's magic and by that its not Harry Potter.

Well thank you for reading and please PLEASE leave a review or comment, critics for my grammar is also ok. thanks