Trafalgar Law is one of the members of One Piece's Worst Generation and an incredibly powerful pirate who hails from the North Blue. As the captain of the Heart Pirates, Law amassed a massive bounty of 200 million berries before the two-year timeskip and since then he's only gone from strength to strength. In the New World, Law has established himself as a key player of the New Generation. In fact, Law was the trigger to everything that's happening in Wano Country currently.
One of the biggest talking points about Trafalgar Law is certainly his Devil Fruit ability. Law was fed the Ope Ope no Mi at a very young age and this fruit gave him the power to create large spherical ROOMs within which everything was his to control, from the terrain to the people inside it. While the Devil Fruit's basic power in itself is quite frightening, it is the awakening of the Ope Ope no Mi that makes him much more dangerous.
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The Ope Ope no Mi is quite an overpowered Devil Fruit on its own. During One Piece's Punk Hazard arc, fans got to see how incredible this fruit really was when Law took on the G5 unit all by himself and ended up defeating every single one of them without even breaking a sweat. In the Dressrosa arc, his abilities were countered well by Donquixote Doflamingo, however, despite that, Law had more than a few tricks up his sleeve, such as Gamma Knife. Strangely enough, by Dressrosa, the Ope Ope no Mi hadn't awakened or Law would definitely have used its powers on Doflamingo, his worst enemy. Law waited 13 years to avenge Corazon and only relied on Luffy to take Doflamingo down as a last resort, meaning the fruit likely hadn't awakened at the moment.
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