Rayleigh was a Haki monster with immense power, feared even by the Four Emperors in his prime. Sengoku and Whitebeard were also formidable users of Haki, rivaling even the Pirate King, Roger ...
With strong characters, it is a given that Oda will also start introducing some very powerful abilities, both in terms of Devil Fruits and Haki. The Red Hair pirates have no devil fruit users.
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