One Piece Crossover

Lost his parents to betrayal and his grandmother to sickness. Eagan was almost left alone in the world with no one to rely on and then he got a system that informed him about the impending doom in his world.

Kiyoshi is a young samurai cursed at birth with a demonic sword containing one-third of hell's army sealed away in it. He travels the war-torn lands as a mercenary and assassin, living a life alienated from the rest of the world. Until one day, a unique and dangerous job escorting a pregnant elder mage name Nzuri has the samurai questioning himself and what life has to offer. With everyday just being one mission after the next will the cursed samurai finally find peace in his life or is he destined to live a life of destruction and chaos. Only time with tell with dangers around every corner, but what can be more dangerous than a samurai that can bring the apocalypse but just having an off day?

Betrayed and humiliated. Robert was seen as the student who fell from grace after the death of his adopted father. Many referred to him as the Emmetts’ adopted bastard. Some saw him as the bad luck that led to the death of his adopted father. All of these put Robert in a downtrodden position where he is mocked and trampled upon by any and everyone. His girlfriend dumped him for his cousin, and the Emmetts expelled him and his adopted family into abject poverty. Unknown to everyone, he wasn’t a nobody; he was the Graham heir and the most powerful man in the world as the Master of the Council of Rulers. Just one phone call, and Robert was back to who he truly was and his mind is set on one thing—VENGEANCE!

Kelvin Sylas Blake lived a simple life in the quiet village of Ashvale, dreaming of one day becoming a knight despite his humble origins. But on the night of his sixteenth birthday, everything changed. Under a blood-red moon, his village was reduced to ruin as vampires and werewolves descended without mercy. In a single night, Kelvin lost everything. And then… he died. But death was not the end. From the ashes of that night, something new was born. Something that should not exist. Long ago, a prophecy spoke of a power unlike any other. A being from whom a new race would rise, one destined to hunt all supernatural beings. Now that power has awakened. What path will Kelvin choose? Vengeance… or something far greater?

In a world where sorcerers, demons, and magic exists, lies six kingdoms, each with their own history, culture, and ruling familes, and all of whom are combined into one greater magical empire, THE SUPREMACY. The supremacy is an empire of the only six kingdoms in the world with natural born magic users, and has been ruled over by the Royalé family, the most powerful family of sorcerers in existence, for almost a thousand years. When a great calamity strikes, an unknown force wipes out the entire Royalé family in a single night. Lord Hector, king of Tremore, one of the six kingdoms of the supremacy, walks over the rubble and finds only one survivor, a new born daughter, the last living member of her family, and decides to raise the child as his own Valkori, his adopted daughter, grows quickly and more powerful each year, and all seems to be going well for King Hector, who had been appointed as the new Sovereign of the supremacy in light of the Royalé family's extinction, however a new threat arises when external forces begin to plot a rebellion for his throne, an extraction of princess Valkori, and King Hector must do everything he can to protect his empire, by any means necessary...

On the day the world split apart and the sky burned red, something new filled the air, an energy no one could name, but everyone could feel. It remade humanity overnight. Some people woke up able to shatter stone with their bare hands. Others could summon fire, call down storms, even twist space itself. And then there was Daniel. A mind-user. The weakest class there was. With no flashy powers or lethal attacks. Just an unfailing memory, faster reasoning, and a knack for seeing patterns others ignored. That is, until the mission that should have killed him. Buried in the ruins, he found relics from the old earth, and an idea that refused to leave. If people could draw power from the strange energy in the air… maybe they could connect to it in a deeper way. So he tried. What started as a fragile creation, a “system” that could barely identify objects began to learn. It grew like a child finding its voice. And one day, it woke up. Then it spread. Suddenly, the world began to change. Levels. Quests. Rewards. Power. The rules of reality itself started to look like a game. And everyone wanted to know the secret behind it. But when the game takes on a life of its own… will Daniel still be the one in control?

Joe always felt his life was meaningless. He had no accomplishments to be proud of, and his overly indifferent nature caused him to miss out on many opportunities in life. Joe had resigned himself to the fact that if this was his fate, then so be it. Until one day he received a frightening message from an unknown number claiming that they could make Joe's life more meaningful. Of course, Joe didn't believe it, but for one reason or another, he decided to follow the tormentor's instructions. Finally, here is Joe, tossed around in many new worlds, reborn to become someone useful by helping others. But, not as the main character in a fantasy kingdom story as a handsome king with many concubines... Joe was destined to be an 'observer' in this new world.

They called him trash. A charity case. The broke scholarship kid who didn’t belong. Robert was used to surviving off scraps, laughed at, stepped on, and ignored. But the day his mother collapsed in a hospital bed, and he begged his so-called friends for help, they didn’t just turn him away… they crushed him. Publicly. Brutally. And then his phone rang. One call. Just one. In an instant, the life of the school's poorest boy shattered—and reformed into something no one saw coming. Robert Hayman was gone. In his place stood Robert McAfee… heir to the world’s most powerful hidden dynasty. Now, the tables have turned. The boy they mocked is about to become the nightmare they can’t escape. Let the reckoning begin...

Vanillope was accused of killing her own mother and was sent to juvenile, inside she was tortured, starved and beaten but those pain was nothing compared to what awaits on her, she was sent on a battle ring in fight with the other prisoner that has only one objectives: to kill or to be killed. But little did she knew it was just the start, the start of the concept of killing each other. After winning she was sent to a more horrible place where a systematic maze game were happening, where you can't do anything but survive in order to achieve what you want. But for her, she will do anything to achieve what she want which is revenge. A little tip, if you want to survive on a maze, one thing you better do; unleash that devil inside you.

"You are nothing to me. I have never wanted you, neither will I accept you now.  Go, I never want to see you again. If I do, I may not be able to hold back from killing you with my own hands." Dean watched his father say to him. Raised by his grandmother, Dean Connor had a hard life until he graduated from college, proposed to his sweetheart, and planned to start a big business. But one night, everything changed. He ended up in jail for a murder charge, with no one to support him, not even his fiancee or grandmother. Also, he only has three years to live. Will he escape this nightmare and take revenge on all his enemies or will he perish as a loser?