One Piece: Big Mom Was Pregnant for Five Years, and I Became a Sea Dragon

That year, Su Chen transmigrated into the world of pirates, only to discover that he had become Big Mom's son. But he was still an unborn baby in Big Mom's womb. What's more, he awakened a Devil Fruit System. At birth, he could have two or three Devil Fruits, and every day he could refresh his talents to reveal Devil Fruits with different attributes, continuing until he found the ones he wanted. In pursuit of perfection, Su Chen spent a full five years refreshing his talents inside Big Mom's womb. Then, one day... "Ding! System refresh successful. Congratulations on obtaining the [Dark-Dark Fruit] and the [Glitter-Glitter Fruit]!" "Huh!? Only two Devil Fruits? Oh! With the Dark-Dark Fruit's ability, I can absorb another one in the future!" Su Chen stunned everyone the moment he was born. Charlotte Oven: "He didn't cry or fuss when he was born. He can stand and talk, too. And you expect me to believe he's a normal baby!?" Katakuri: "Su Chen, I admit defeat... The future of the Charlotte Family is in your hands!!!" Doflamingo: "You're telling me this is a child!? Isn't that just a form changed by a Devil Fruit??? I'll never believe I lost to a kid!!!" Sengoku: "He's this strong at such a young age. What will he be like when he grows up!? Oh no! The Marines have another unbeatable enemy to worry about..." From then on, the world of pirates had a new legendary figure.