Tsuna & his Guardians suddenly find themselves thrust in the past to fight the same enemy as the Vongola Primo. Now not only will they have to worry about getting back home, but also avoiding death at the hands of the suspicious 1st Generation Guardians.

In a virtual world, players are to conquer 100 different parallel worlds in order to reach the title of 'boss.' Tsuna is a player of the Cielo class and a master of all weapons. His goal is to become 'boss' of all the worlds and gain the title 'Decimo' as the tenth player to attain this title. But, in the real world, he is no other than 'Dame-Tsuna,' a loser in most peoples' eyes.

Due to some imbecilic force known as Byakuran Gesso, Reborn ends up in a parallel world with a mission. Left with only a watch-like thing as communicator, Reborn must find a way to survive in the unknown world. What is Byakuran's real motive? Will Reborn manage to finish his mission and get back to his own world? TYL setting, adult Arcobaleno, parallel world. [ON HIATUS]

Response to a challenge. Tsuna found himself in a parallel world. It was bad; his guardians don't know him. Worse, everything he knew is twisted. Worst of all, he just can't leave without fixing what the other 'him' left.

Tsuna is killed by another Famalia, but Uni and Byakuran use their power to send Tsuna to a parallel world in order to protect her friends. She's a five year-old and grows up with Byakuran and Uni, training to be stronger. Will she be able to protect her family this time around? Or will her fate be the same as before? Fem27 BEING REWRITTEN

[BEING REWRITTEN & ON HIATUS]

In a parallel world, Vongola is usually ruled by women besides two, Vongola Ottavo Daniel, and the soon to be Decimo, Sawada Tsunayoshi. Everyone is the opposite gender from the other parallel world, besides Tsunayoshi and his parents, what exactly is going on here? Will everyone fall for Tsuna? WARNING! OOC-ness and AU!

Vongola Primo seeks the help of Tsuna when someone attempt to use a time machine to kill the Giotto of the Past. Tsuna have to travel back in time to prevent this or risk disappearing forever.

Unsurprisingly, Tsuna is once again shot by the malfunctioning Ten Year Bazooka. When he opens his eyes, he finds himself sleeping on Hibari's lap. What's more, in this world, it seems that Tsuna's the carnivore and Hibari's the herbivore. 1827

In a parallel world, Sawada Tsunayoshi lived by himself. Then, a small event changed it all. He received memories from his other self. His life spins into a different direction. Suddenly, meeting friends he's never seen before, a whole new trouble coming his way. What else would those memories cause? Slight AU, no pairings just family fluff

They had turned their backs on him... After that fateful day he had killed... They looked away from him. He then wishes to go back to the time when his friends wouldn't fear him... and the next thing he knew... he was back in his old room ten years ago...

AU, Gen. "Humankind cannot gain anything without giving something in return. To obtain, something of equal value must be lost." Now, everyone hates Tsuna, including his Family. But that was the price for receiving another chance to change the grisly Future.

Belated request for xXxShiniXKazexXx 20YL Lambo oneshot "Okay, Tsuna. Let's change the future."

Tsuna had dreamed of some crazy future where babies were hitmen and he'd become a mafia boss, but he never imagined it would come true. Gen, AU/timetravel-ish.

The Future is bleak. But Tsuna sets out to change it. He has changed. He becomes a New Sky. Nothing will stand in his way towards his goal. No one shall harm his family. Tsuna has seen the future, he knows what to do. But how will he go about it? 2796

Tsuna and co. are dead. But, a gift, bestowed on the boss, allows him rewrite their fate. Now, Tsuna wakes up, only to find his mother telling him about his new tutor. A new resolve burns within Tsuna to unite them all once more. But personal feelings are a bane to mafioso for a reason. This is his second chance. Will he screw up? Authoress's name changed, was "Akatsuki-Yume"

AU: In many parallel universes, the Vongola is a righteous family that is ruled by Tsunayoshi Sawada. In this universe, not so much, but hey, their loss is another's gain. TSUNAxCHROMExYUNI, MillefioreTsuna.

SEQUEL TO 'What If! Parallel Tsuna has now entered the world of Mafia! Will he ever survive? Or will he be a coward and run away again? Read on to find out... :

Although Tsuna and his party did return to their original time, they did not come back to their world. By someone's interference the group is sent to a parallel world. A world that contrast theirs. Where the skies are only beautiful when it is dark.

In a strange, parallel world to the one that we know, it was not Tsunayoshi's soul born in the child of Sawada Iemitsu and Nana. Meet Sawada "Xanxus" Ieyoshi, this dimension's Vongola Decimo… can anyone else say "oh dear"? Drabble Series

Tsuna woke up one day and found himself holding hands with Yamamoto. Later he realizes that he was transported to a parallel world thanks to the malfunctioned bazooka. Wait, there's more? In this world he and Yamamoto are actually a… COUPLE? Wait! WHAT?

AU: In one particular parallel world, Tsuna did not meet Reborn and did not make friends with anybody, therefore continuing his miserable life alone. He is an adult now, but he wishes to turn back the time and change his life once and for all. Full summary inside.

Tsuna was sent to another parallel world after all his guardians were killed saving him and he himself was in great danger.But in this new world,a stranger replaced his spot in the lives of his friends.Can Tsuna get his 'comrades' to be his friends again?

Memory of him as Vongola Decimo is a curse and blessing for Tsuna. He is set to choose his own path, far away from mafia world with his friends. Beside, he has his twin chosen for that throne. Reborn is not sure what to think of Iemitsu's older son. There's something hidden beneath those amber eyes of the charismatic president of Namimori Gakuen. M for violence only

Tsuna is given another chance at life after his guardians die, in a parallel world where he is still Dame-Tsuna and someone else is the Tenth. He is a stranger to his friends and his life there is a lot more different than Tsuna had first thought.