Yonkou

The Emperors
The Yonkou are the four strongest pirates on the Grand Line. Their strength is incredibly fearsome; simply one of them is a threat to the Marines. They each hold territory and typically remain passive, but recent events have changed the balance.

Current Yonkou

 * Adas: Known as "The Judgement," Adas is the most reserved out of the Yonkou. He rarely acts in ways that alarm the World Government, but that has changed with the rise of another Yonkou. Adas combats using Haki, Martial Arts, and his Devil Fruit, the Kusai Kusai no Mi (Decomposure).
 * Sven Frieglord: Known as "The Bloodthirsty," Sven is the most cruel and brutal out of all the Yonkou. He holds no ill will towards anyone, but slaughters anyone he chooses. However, the rise of the Alliance has forced him into hiding. He combats using Haki, a swordbreaker, and his Devil Fruit, the You You no Mi (Drain).

Deceased Yonkou

 * Chalice Meridian: Known as "The Graceful," Chalice was the most upbeat and least dignified out of all the Yonkou. She suddenly rose to power by eliminating a Yonkou in a one on one duel and was the youngest to ever attain this position. Her legendary actions changed the course of world history for eons to come. Using her Hyun Hyun no Mi, Chalice was the strongest swordsman of her time.
 * Granulf Edelstein: Previously known as "The Valiant," Granulf was slain in one on one combat by Chalice Meridian. He was a large man who was a bit absentminded, but nearly peerless with a broadsword.
 * Ifkes: Previously known as "The Cunning," Ifkes attempted to fight off a joint invasion by Adas and Chalice. He was the weakest in combat out of all the Yonkou, however, and was quickly killed by the two. His strategic planning was legendary, but the cause of his demise. Smarts paint a big target.