Right of Kaidou's defined abs is his only scar: a massive, recessed X-shape whose upper points reach to his pectoral, given to him by Kozuki Oden. Twenty years later, Roronoa Zoro managed to add another scar to Kaidou's chest that runs from the top left point of the first scar to near his left shoulder.
Oden faced Kaido in Wano and gave him a huge scar. Oden's swordsmanship combined with his Haki was enough to bring down Kaido to his knees.
Oden, in fact, dealt an x-shaped blow to Kaido's neck with his Two-Sword Style, Paradise Totsuka technique. This results in the scar Kaido has on his body, meaning that while he has been reviled as an invincible enemy (and all of Luffy's attacks on him did zero damage), it's not impossible to harm his body.
It is a known fact that Kaido has lost to his fellow Yonko and the Navy a combined 7 times and been captured a total of 18 times. While Kaido might be the strongest in terms of raw strength, there are definitely those who can beat him a fight. Write for Us!
- Zoro left a scar on Kaido's body which means he penetrated / destroyed his scars and bypassed their regeneration ability .
It's entirely possible Mihawk noticed through their duel and training that Zoro suffers from ocular dominance in his left eye. That is to say, the left eye is stronger than the right. As a result, maybe Mihawk scarred the left eye shut and instructed Zoro not to open it until his right eye was trained enough.
In the manga, it showed he lost it by throwing the little blade of Mihawk, like he did for the cursed sword, but he wasn't ready for even the tiny little knife and he loses his eye.
Garp Is Considered To Be One Of The Strongest Marines. Also renowned as 'Garp The Hero' and 'Garp The Fist', Monkey D. Garp is a Vice-Admiral of the Marines. Being their strongest known member in history, there's no denying that Garp is capable of taking on Kaido.
Garb is a Navy hero and someone who holds legendary status in the world of One Piece. He is someone capable of fighting against Roger and Whitebeard back in the day. He even fought against Captain Rocks on God Valley. Garp may be old right now, however, he is still more than capable of taking on Shanks in battle.
He has a natural talent in Haki and swordsmanship. Oden is the first person to gravely injure Kaido and fight with him on an equal level. Though Oden suffers defeat, he is by no means weaker than Kaido. Oden would have definitely won against Kaido if not for the deception.
Due to his power, Kaido received the title of the "Strongest Creature in the World." On numerous occasions, Kaido mentioned that only a handful of people have ever managed to hurt him in a fight. He named Shanks, Roger, Whitebeard, Xebec, and Oden as the only people whom he considered to be on his level.
Kaido is an Oni. Oni are hulking, monstrous demons in Japanese mythology. In the One Piece Universe, Kaido is an Oni (Ogre) and is a separate species as humans.
Shanks' scar caused by Blackbeard because he's mistaking the gomu no mi with yami no mi which Blackbeard been searching for decades.
Jack is one of Kaidou's three right-hand men, implying that the Emperor has great trust in him and his power.
Despite being a Vice-Admiral, his strength surpassed that of an Admiral. Garp has previously fought characters such as Roger and Whitebeard and is spoken about in the same breath as them. Someone like him is bound to be stronger than Dragon, at least in his prime.
On top of this, Dragon also has his unique fighting style called Ryusoken. What's more, he could also possess a Devil Fruit power related to wind and all that would make him powerful enough to potentially beat Blackbeard.
It is evident that the only person capable of surpassing Roger is Luffy. Even though Luffy still has a lot to achieve, he is the only person who can transform the entire world.
Luffy is close to Shanks in terms of power and it is only after their fight that he will officially be able to call himself stronger than Shanks.
Kozuki Oden and Roronoa Zoro both gave him permanent scars with their swords attacks. Keep in mind that neighter fighters have unlocked the ability to forge "black blades." Mihawk should be strong enough to scar Kaido as well. It should also be noted that Kaido considers Shanks to be his equal.
The man known to be the strongest creature, Kaido is widely known to be the most powerful pirate right now, and the mightiest of all Yonko currently. He was an apprentice on Rocks D. Xebec's ship long ago and he was given his Devil Fruit by Big Mom on God Valley. Since then, Kaido has continued to grow stronger.
Charlotte Linlin. Also known as Big Mom, Linlin is one of the pirates who defeated Kaido in a fight. Both got stronger as they grow old and it's not very surprising if Big Mom can still defeat Kaido.
Meanwhile, Furiko eventually married a village swordsman and gave birth to Roronoa Arashi, Zoro's father. Unfortunately, both of Zoro's parents have already gone to the great beyond. Arashi lost his life in a battle with pirates, while his mother succumbed to illness.
Prior to One Piece's timeskip, Zoro's left eye was fully functioning and completely uninjured. Yet when the Straw Hats reunited after their respective adventures, Zoro's left eye was mysteriously scarred shut. Prior to the timeskip, his left eye had been seen glowing when using certain attacks.