Edward Weevil, or “Whitebeard Jr.”, is the self-proclaimed son of “Whitebeard” Edward Newgate and one of the Shichibukai. His powers have been praised by Kizaru who compared his abilities to that of a younger Whitebeard, his alleged father.
He was able to single-handedly defeat 16 pirate crews affiliated with Whitebeard, including the A.O Pirates.
8-SENGOKU THE BUDDHA
Sengoku the Buddha was the Fleet Admiral of the Marines pre-timeskip, succeeding Kong and preceding Akainu.
Alongside Garp and Tsuru, Sengoku is one of the most powerful Marines of his generation. Even without his Devil Fruit powers, Sengoku has enormous strength, enough to effortlessly hold down an enraged Garp with only one hand.