#1 – Marshall D. Teach
Marshall D. Teach, also known as Blackbeard, is an immensely powerful pirate even for a (former) member of the Whitebeard Pirates and Shichibukai. Ace once stated that Blackbeard could have been a commander when he was recommended for the position, thereby proving that his strength was equivalent with any of the other commanders, which is extremely notable, as he had not yet eaten a Devil Fruit. The most prominent feats of Teach’s power was defeating three commanders of the Whitebeard Pirates: Portgas D. Ace, Thatch, and later during the Payback War, Marco, the new Captain of the Whitebeard Pirates.
As a member of the Yonko that rule over the New World, Blackbeard is recognized as one of the four strongest pirates in the world. He possesses tremendous physical strength and superhuman endurance.
Blackbeard has become the first and, so far, only user to wield the powers of two Devil Fruits at the same time. With the power of darkness (Yami Yami no Mi), which “reduces anything to nothingness”, and the power of quakes (Gura Gura no Mi), which “brings destruction to everything”, Blackbeard claims himself to be truly invincible and the strongest of them all.