He had only come here to fulfill a dying wish from a younger version of himself, to take his place in this world as Sawada Tsunayoshi. That had been fine, boredom plaguing him constantly in his long life as nothing seemed to matter anymore. So when Reborn arrives to train him as Vongola Decimo, he ends up with something a little more. Dark!Tsuna, Dark!Universe, slow R27 COMPLETE

AU. No-good Tsuna was all just an act. In reality, Tsuna was a famous mafia hacker hidden by the name Erebus that could bring destruction to all mafia Famiglias. But when a hitman called Reborn appears to train him to be Vongola Tenth, things just got a whole lot more complicated. If his identity is found out, he just might be killed by his own tutor.

Reborn had never disagreed with any of the ninth's decisions, but when the Vongola boss sent him to Japan to train Sawada Tamaki, the hitman started to think that the ninth had chosen the wrong twin…

An incident with the 10-year bazooka leaves Tsuna stuck in the past… What's he gonna to do now? R27, hints of All27 and certain Arcobaleno27 - COMPLETED

AU, Earth and Meraviglie are two worlds interconnected by a barrier however it's only known to a selected few. Those that can travel to the other world and have the ability to make pacts with those in the other world are known as Capturers. Tsuna, having that ability, accidentally stumbles across a humanoid man with a fedora hat. Full Summary inside, Arcobaleno27, main R27

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...

Feeling like he and his friends have drifted apart, Harry makes the choice to start over somewhere new. He should have known that even in another world, trouble would still find him; this time in the form of a strange detective. Deaged!Genius!ESP!Harry

Tsuna pouted as his family made fun of his imaginary friend, it wasn't his fault they couldn't see him. It wasn't his fault that they couldn't see the tall man with a fedora that was behind them watching everything with those sharp dangerous looking eyes of his. Fluff mainly. No pairing! Parental!Reborn, child!Tsuna

Dragon's fire is not so easily extinguished; when Zuko rediscovers a lost firebending technique, shifting flames can shift the world... Follows "Theft Absolute".

Thirteen years ago, Sawada Natsume was born. Ten years ago, a mysterious brunet showed up at the Sawada family's front door. Now, the two boys live with each other as brothers. When Reborn comes to train Natsume into Vongola Decimo, he wasn't expecting to find two boys, much less one with a secret that goes back 400 years in time. OOC Tsuna.

Dame-Tsuna, they called him, and though he ducked his head ashamedly to the misnomer he honestly didn't care.  In the end it was all just stupid names and titles, and only the truth mattered in the end. Tsuna knew full well who he was and what he needed to do: that is, until Reborn and the rest of the gang entered the picture.  Dark!Tsuna, Family!GoM

Sawada Tsunayoshi was just an ordinary, harmless teen, according to the files given to Reborn by the Vongola. But it seems like the information was wrong, very wrong: ordinary boys weren't feared, ordinary boys weren't so respected, and certainly ordinary boys weren't irrevocably insane.

Sawada Tsunayoshi is ordinary. Average. Not at all special in any way. So while having ties to the mafia comes as a surprise to Tsuna, the fact that his younger, more talented, more popular twin brother is chosen as the next Vongola boss doesn't. Not everyone agrees though. After all, what is a world without a proper sky?

On that fateful day, two Potters were born. One was destined to be the Boy-Who-Lived. The other was forgotten by the Wizarding World. Now, as the Triwizard Tournament nears, a strange boy is contracted to defend a beautiful girl.

Tsuna, forced to attend one of his tutor's secret dealings, experiences first-hand color gangs, DOLLARS, games and the mystery that is Ikebukuro. Ikebukuro did not know what hit it when the Vongola Decimo stepped into its territories.

It began on the night when Hibari popped out of his wardrobe. Then from under his bed, his kitchen cabinets, the janitor closet, and trashcans. And as he grew older, slowly but surely, little Tsuna's fear became something akin to love. /Eventual 1827/

What if Wormtail hadn't told Lord Voldemort the Potters hideout. What if he took Harry straight to him instead? A Dark Harry fanfic. AU Mild HG