Power Level as of Chapter 128

(Directly brought from [Notice])

Imu > Kaidou >= Shanks = Mihawk >= Big Mom > Dragon = Garp = Sengoku >= Rowan (mc) > Bullet = Sakazuki = Ryokugyu > Borsalino = Kuzan = Issho = Rayleigh > Marco = Beckman >= Katakuri = King (Alber) = Shiki = Gaban > Zephyr > Ace = Teach > Carina = Dan = Sabo.

- You may see more OCs in the future, however, none of them will be stronger than Crocodile. Only the weaker ones will be made to fill in the gaps and make the story seem more alive.

- I didn't include ones like Jozu, Vista, Queen, Smoothie, Cracker, etc. Think they lie somewhere between Teach and Carina though. Jack? He's equal to or below Sabo.

- You may wonder why Mihawk is placed so high. But I do believe that there have been many hints that suggest just how strong he is: his title as the 'Strongest Swordsman in the World,' him being Shank's rival, and his eyes... which resembles that of Imu's (and how did MIhawk end up joining the Seven Warlords?)

_____________

[Update as of chap 160]

Imu > Kaidou >= Shanks = Mihawk >= Rowan (mc) = Big Mom (Linlin) > Dragon = Garp = Sengoku >= Teach > Sakazuki = Aramaki (Ryokugyu) > Borsalino = Kuzan = Issho = Rayleigh > Marco = Beckman = Carina >= Ace = Katakuri = King (Alber) = Dan = Cavendish = Gaban > Hancock >= Gion > Weevil > Zephyr > Sabo.

- But for 12 minutes where Rowan resorts to going all out, Rowan >= Kaidou.

- You may think that Teach is over-buffed. But I'm keeping him like this. After Sabaody Archipelago, not only did his Haki improve, but he also attained the Tremor Tremor fruit. Although he still lacks behind Rowan, do note that he never used his Cerberus devil fruit