One Piece Kaido X Big Mom. It is true that she agreed to be a part of Kaidos New Onigashima project and entered into an alliance with the Beast Pirates. Mihawks power level is still a big question mark though.
The main villain of One Pieces Whole Cake Island arc Big Mom possesses the Soru Soru no Mi which allows her to steal the souls of other people. 15-19 and Episode 952 Kaidou and Big Mom begin their fight. In the most recent chapter of One Piece both Kid and Law were forced to push themselves beyond their limits.
So if Big Mom and Kaido were working with one another that long ago it is possible that they may have had an actual relationship with one another.
15-19 and Episode 952 Kaidou and Big Mom begin their fight. With the Big Mom Pirates and the Beasts Pirates now having joined forces the new crew thus formed comprises of some very powerful pirates. Big Mom is a wild-card in the Onigashima raid. 15-19 and Episode 952 Kaidou and Big Mom begin their fight.