Portgas D. Ace is the sworn brother of Luffy and Sabo in One Piece and one of the most crucial characters. Ace was born on Baterilla, a small island in the South Blue and was taken in by Garp after the death of Rouge. Being Roger's son, Ace was destined for greatness and he ended up becoming the Second Division Commander of the Whitebeard Pirates.
Ace's rise to power saw him crush several strong enemies and ultimately gain a bounty of 550 million Berries.
10 Monkey D. Luffy
Ace and Luffy grew up together as brothers on Mt. Corvo under the care of Curly Dadan. The two often challenged each other to fights and pushed the other to grow stronger. While Ace honed his physical abilities during these duels, Luffy learned how to control his Devil Fruit better.
Ace is known to have won every single fight the two have fought right until Luffy turned 14 years old, as confirmed by the latter himself during the Alabasta arc of the story.
9 Bluejam
The Captain of the Bluejam Pirates, Bluejam was a big villain who stood in Ace and Luffy's way back during their time under Dadan's care. After the fire of Grey Terminal, Bluejam targeted the two and wanted to steal their treasure, however, Ace, stood in his way and took him on in a fight.
Despite being very young, Ace was able to defeat Bluejam and even carry Dadan to safety, treat her wounds, and then bring her back to their home.
8 Smoker
One of the many skirmishes that happened in the Alabasta arc, Ace's fight against Smoker came shortly after his introduction as the Second Division Commander of the Whitebeard Pirates.
Being Luffy's elder brother, Ace quickly jumped to his rescue once he saw the White Chase on his tail. Although Ace didn't fight Smoker seriously, he was able to stop him in his tracks quite easily and buy enough time for Luffy to escape from the Navy's grasp.
7 Doma
One of the famous pirate captains of the New World, Doma, also known as the Bohemian Knight, once stood in the way of Whitebeard and his crew. Ace took it upon himself to take Doma on in a fight and effortlessly managed to defeat him.
After the fighting wrapped up, Doma was revealed to have joined the Whitebeard ally fleet and became one of the 43 allies of the crew. Doma also made it to the Paramount War where he took on several Vice-Admirals of the Navy.
6 Jinbe
Also known as the Knight of the Sea, Jinbe was one of the closest people to Whitebeard, thanks to the Yonko protecting Fishman Island with all his might. After finding out that Ace was attempting to take Whitebeard's head, Jinbe stepped in his path and fought him in a high-level duel.
The battle lasted for 5 days and saw both of them collapse at the same time. Evidently, it ended in a draw, however, Ace got up immediately afterward to defend his crew from the incoming attack of the Whitebeard Pirates.
5 Blackbeard Pirates
After the death of Thatch, Teach fled the Whitebeard Pirates with Ace in hot pursuit. Eventually, the Blackbeard Pirates were met with an angry Portgas D. Ace at Banaro Island, where one of the most important fights in the Great Pirate Era ensued.
Before Blackbeard could fight Ace, his crew attempted to attack him but were immediately defeated by Ace at once. Ace's power was so overwhelming that Blackbeard warned all of them to stay away from him at any cost.
4 Marshall D. Teach
Ace's fight against Blackbeard was one of the most difficult ones that he's ever been in. After encountering him and his crew on Banaro Island, Ace was able to give Blackbeard a run for his money and wound him severely. However, the power of the Yami Yami no Mi proved to be too much for him to handle.
Impressively enough, even when his ability was nullified, Ace put up quite a fight and earned praise from Blackbeard himself. To date, this fight remains to be one of the greatest to have ever taken place in the story.
3 Aokiji
Ace and Aokiji went head-to-head shortly after he was freed from his shackles during the war of Marineford. To protect Luffy, Ace stepped in to take on the Navy Admiral in battle and did quite well against him.
He was able to completely vaporize Aokiji's Pheasant Beak using his Flame Mirror. Although the fight was pretty short, Aokiji failed to stop Ace and his ice powers were absolutely no match for Ace's fire.
2 Akainu
Ace's final fight in the story came against none other than the Navy Admiral Akainu. The Admiral used underhanded tactics to talk Ace into attacking him and knowing Ace's personality, it worked pretty well. As fire clashed against magma, it was inevitable for Ace to get burnt.
While the fight was far from over at this point, Akainu quickly turned his attention to Luffy and tried to kill him. To protect his brother, Ace put his body in between and got pierced right through the chest, ultimately dying in his brother's arms.
1 Whitebeard
The strongest character that Ace has ever fought in the story so far is, undoubtedly, the Yonko Whitebeard. The two are known to have engaged each other in combat at least a hundred times, with Ace losing every single of those fights.
Ace even attempted to kill Whitebeard in his sleep but, once again, failed to do so since Whitebeard was that powerful. Eventually, Ace gave up trying to kill Whitebeard and ended up becoming his son.
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