In a world where human and monsters relied on mystical fruits and their inner power to fight for dominance, a lost soul was thrown, given the powers from all the other worlds he's known. But there was a catch; he had no control over what power he would get! With knowledge beyond that of most, he sails his path to the top of the one piece world! - Description from Novelupdates
Crossing to One Piece world, he became Roger's younger brother.Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.Fortunately, at the age of sixteen, he actually found himself with a possession soul system.He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.If you think that he can only Purchase these? Then you're wrong!Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased. - Description from Novelupdates
Traveling through the world of movies, TV series, cartoons and novels, you can freely copy the blood, skills, knowledge, and even memories of others - Description from Uukanshu
He doesn't want to be wanted for bounty, or be a pirate, but if there's no other choice, he can only become a pirate..Let the world turn upside down! - Description from Novelupdates
All Things of this World, Turn to Ashes, Flowing Blade-like Flame!Crossing over to the world of pirates(the one piece world) , in the era of pirates, the Roja from eleven years ago obtained a Sword Soul system that lets him strengthen infinitely and extract various kinds of skills.Flowing Blade-like Flame (Ryjin Jakka) , Mirror Flower, Water Moon (Kyoka Suigetsu), Moon Fang Heaven-Piercer (Getsuga Tensho), Thousand Cherry Blossoms (Senbonzakura)"If this sword descend, you may be roasted to death." Roja looked at Akainu in front of him and seriously said. - Description from novelupdates
Death is sometimes not the end!Dead prison!This is a magical prison. It has the ability to draw the souls of the dead people of the world, and it also enables people to gain the ability of the souls of the dead.When Qin Song woke up, he was shocked to find that he had come to the world of One Piece, and even more surprised that he found a prison in his body.. - Description from Uukanshu
Soul Piercing Konoha, born as a civilian, will go to the battlefield of the Third Ninja World War tomorrow.Just graduated from "Ninja School", Yangtai, who only knows three body techniques and a D-level hemostasis technique, looked at the full of energy, and finally made up his mind "The battlefield is too dangerous, I'd better go to other worlds to hide. !" - Description from Novelable
Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.-Do you think that your fire is very powerful? I have the burning fruit.-Do you think that your thunder is very powerful? I have a thundering fruit.-Do you think that your otter is very powerful? I have the frozen fruit.-Did you said you want to die? Don't worry, I also have a nickname: Death Doctor. - Description from Novelupdates