10 – THE REMNANTS OF THE ROGER PIRATES
The Roger Pirates were the crew of the late Pirate King, Gol D. Roger, and were the only crew to ever reach Laugh Tale, the end of the New World in the Grand Line.
The things they did were part of legends. They made it as far as Skypiea and the end of the Grand Line, Laugh Tale, on their ship the Oro Jackson.
Even though the crew disbanded, the Marine would never allow the crew to be forgotten. If a crew member is encountered, the Marines cannot simply let them go. Similarly, Portgas D. Ace, being the son of Roger, is not spared from this prejudiced hunt.
9 – KOZUKI MOMONOSUKE
Kozuki Momonosuke is an inhabitant of Wano Country and the son of the late daimyo of Kuri and patriarch of the Kozuki Family, Kozuki Oden.
He has the ability to communicate with the giant elephant Zunisha, being capable of seeing through its eyes and giving it orders, which is the only way it can do anything but walk. Should Momonosuke order it to attack, he is in command of a powerful weapon capable of wiping out fleets in a single blow. Like his father, Momonosuke also has the ability to hear the “Voice of All Things”.
8 – NICO ROBIN
Nico Robin is the only person alive who can read the language written on poneglyph tablets, which contain records of ancient history; this was the true reason why her first bounty was so high, despite being issued when she was only 8 years old.
7 – SHIRAOSHI
Princess Shirahoshi is the current form of Poseidon, one of the three Ancient Weapons capable of mass destruction.
Poseidon was a Mermaid Princess who lived in the Void Century that had the power to talk to Sea Kings, enormous sea creatures capable of mass destruction. As stated in a conversation between Neptune and Robin, Shiraoshi has now inherited the title “Poseidon”.
6 – BIG MOM
Big Mom is a born monster who was first issued a bounty at the age of six, making her the youngest known individual to ever have a bounty placed on their head.
Decades ago before the formation of her own crew, Big Mom was part of the legendary Rocks Pirates.
Charlotte Linlin has a Road Poneglyph that can, with all four Road Poneglyphs deciphered, lead to Raftel’s location.
As we know, the possibility of two or more of the Yonko forming an alliance is enough of a threat to cause the World Government to panic, as seen when it unsuccessfully attempted to prevent a meeting between Shanks and Whitebeard.
Right now Big Mom has just formed an alliance with Kaido to conquer the world. This makes Big Mom an even greater danger to the World Government.
5 – KAIDO
Kaido is the “Strongest Creature in the World”. Decades ago before the formation of his own crew, Kaido was part of the legendary Rocks Pirates as an apprentice.
Kaido has gained the reputation of being unable to die. He has been caught and tortured 18 times, and people as powerful as the Marines and other Yonko have attempted to execute him 40 times only to fail as Kaido survived every single attempt because every single execution weapon broke when being used on him. Most notably, Kaido has jumped from 10,000 meters from the sky onto the ground, creating a massive shockwave strong enough to sink a large ship nearby, and emerged only with a headache; it has even become a hobby for him to attempt suicide, only for it to fail.
Kaido recently has entered into an alliance with fellow Yonko Big Mom and her crew, the Big Mom Pirates. Like Big Mom, Kaido possesses a Road Poneglyph too.