Nerona Imu is the secret ruler One piece world and in Elbaf he finally revealed his true face and his abilities. Imu has many overpowering abilities such as the power of Haki and his Akuma no Mi. Through the latter, he can use abilities such as Domi Reversi, Covenants, and Maki, among others. Based on his performance in Elbaf, Imu's strength is far greater than that of any other character, and while he could beat pretty much anyone alive at the moment, there are plenty of things he can beat with one shot in the world. One piece without breaking a sweat.

One Piece: 8 Characters Who Faced Imu and Survived
Most people who take Ima don't live long enough to talk about it. But these characters managed to survive their encounters.
9
Sanji
The Straw Hat Pirates have three overpowered fighters in Luffy, Zoro and Sanji. Although Sanji is a cook, he is also one of the best fighters around. In Wano, he was able to defeat the queen without taking too much damage, showing how much he's grown since the time skip. He even destroyed Kizaru's laser on Egghead recently. Defeating Queen is impressive, but still nowhere near someone like Imu. Imu is the king of the world and in One Piece Chapter 1180 he was able to send Sanji flying with a single kick. Other than Luffy, no Straw Hat would be able to fight Imu for more than a second.
8
Roronoa Zoro
Roronoa Zoro is the swordsman of the Straw Hat Pirates and the first to join Luffy on his adventures. He's only gotten stronger over the years, unlocking superior Haki and gaining new swords that make him worthy of fighting many of the highest levels of One Piece.
So far in One Piece, the strongest opponent Zoro has defeated was King, the Yonko Commander. But in a fight against someone like Imu, Zoro wouldn't land a single punch and be defeated in one hit. Readers have actually seen this before because in One Piece 1180 Zoro was one-shotted by Imu with Maki and sent flying.
7
King
Among the Kaido All-Stars, King is the strongest henchman Yonko has and is his trusted ally. In Wano, King fought against Zoro. With his Ancient Zoan Devil Fruit, known as Ryu Ryu no Mi, Model: Pteranodon, as well as moon blood, he is a force to be reckoned with in battle.
King is undoubtedly strong, but having been defeated by the likes of Zoro, it wouldn't be a surprise if Imu took him down with a single hit. Granted, Imu would have to hit him when his flame went out, but that shouldn't be hard enough for the King of the World, especially with his recent speed feats.
6
Charlotte Katakuri
Charlotte Katakuri is the strongest sweet commander of Big Mom Pirates v One piece. After defeating his mother, Big Mom, he could even become the new leader of the Big Mom Pirates.
Katakuri has incredible power that stems from his Mochi Mochi no Mi, but also from his Haki, which includes Future Sight. He is strong and still has room to grow in the Final Saga, but against someone like Imu, Yonko Commander would be easily defeated in one hit. Katakuri is no match for the likes of Imu, and it's pretty clear by now.
5
Greenbull
Among the current admirals, none other than Greenbull is clearly the weakest at the moment. He made his first move in chapter 1052 after the Straw Hats defeated Kaid. Despite this, he was shown to be far outclassed by the likes of Shanks. Shanks was able to paralyze and frighten him with his Conqueror's Haki at long range.
Even before Shanks' arrival, Wano fighters like Yamato were mostly able to keep him at bay. If Green Bull is easily defeated by Yonk, then against the strongest character in the world, Imu, he could more than easily be taken out in one shot.
4
Kizaru
Kizaru is one of the three Marine Admirals. He has great Haki and a Logia Devil Fruit known as Pika Pika no Mi, which allows him to transform and manipulate the power of light. As one of the admirals, his power is undoubtedly great.
With that being said, Kizaru couldn't beat the likes of Monkey D. Luffy in Egghead. Shockingly, on Egghead, Luffy wasn't even using his strongest powers to fight Kizaru. If Kizaru couldn't even significantly damage Luffy, then it's clear that he wouldn't stand a chance against a threat like Imu. Kizaru's speed wouldn't be enough against someone like Nero Ima.

One Piece quietly confirms its undisputed best devil fruit user
The Best Devil Fruit user has been exposed. This character is on a whole other level in One Piece.
3
Dorries/Brogs
Dorry and Brogy are co-captains of giant pirates. Together, they have a bounty of 3.6 billion, which is in the same range as Yonka's bounty and even higher than Monkey D. Luffy's bounty. Dorry and Brogy are undoubtedly an overmatched duo; against Imu, however, their strength was useless.
When Dorry and Brogy confronted Imu in his nerfed form with Gunk on Elbaf, the two were easily taken down. Imu-Gunko was able to one-shot them and turn them into Domi Reversi'd slave soldiers in an instant. They are some of the strongest characters that fans have witnessed firsthand since Imu took one hit in One Piece.
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2
Sabo
Sabo is the Chief of Staff of the Revolutionary Army. Among the Revolutionaries, Sabo is second only to Monkey D. Dragon in strength, making him an incredibly overwhelming individual who can defeat most enemies that stand in his way. Sabo was deeply involved in the attack on Marijoa, which was carried out in hopes of rescuing Kuma from slavery and declaring war on the World Government.
During this mission, Sabo ended up in the Empty Throne room. There he was confronted by Imu and the Five Elders. Against such a large force, Sabo's only option was to escape. During his run, Sabo was nearly killed by Ima, but luckily managed to pull through, thanks to help from Cobra. If he had launched a head-on attack, he would undoubtedly have died right there.
1
Rocks D. Xebec
The strongest character that Imu has been able to single out is Rocks D. Xebec. Rocks was the leader of the Rocks Pirates, and despite his overwhelming strength and power that rivaled even the Pirate King, Imu was shown to be far superior during the God Valley flashback.
During God Valley, Xebec arrived hoping to save his family. Facing the King of the World, however, he was instantly defeated and Reversi'd by Domi. After meeting Imu, Rocks turned against his allies and family and became a soulless beast. In the end, Garp and Roger put him out of his misery together.
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