With the autumn of Massive Mother, I believe there are two candidates who will finally exchange her, effectively technically 3… however…. I don’t see 1 of the three even being related with how a lot Oda has uncared for her. So we’ll stick with the 2 related ones.
1st. Yamato, on the age of 28. Nonetheless a strong decade away from getting into the “prime ages” of 40s. With loads of potential to develop together with her insane pure physique and Haki potential. I believe she’s the clear opponent for Blackbeard’s feminine pirate, Catarina Devon. With it being the conflict of mythological Satan Fruits. Yamato may even function the “Oden” equal, becoming a member of up with Luffy proper earlier than the conflict towards Blackbeard (therefore we’re seeing her complete “Oden” journey occur within the cowl story).
2nd. Boa Hancock, on the age of 31. Nonetheless a decade away from getting into the “prime ages” of 40s. Her Satan Fruit has insane potential with out even being woke up. She’s a confirmed Conqueror’s Haki person of an island that’s hyped for it’s Haki, but Oda has chosen to maintain her Haki hidden for now. Thus we don’t know her full capabilities as a fighter in any respect. Sarcastically, Yamato the newer character has displayed extra of her prowess than Boa Hancock has.
So the inevitable conflict to be the highest feminine pirate on the seas is between these two. Who would be the strongest at their peak?