This is what I define the final villain of One Piece, I feel like rather than having the traditional single final villain of the story that we’ll have 3 final villain(s) all to be defeated in the final saga.
They each represent the other 3 Gods of the world of One Piece with Akainu being the Earth God, Blackbeard as the Rain God and Imu as the Forest God.
In order to become the pirate King, Luffy and the straw hats will have to overcome those 3 obstacles to get to the top with Akainu and BB already being established as the main villains at Marineford, and now Imu is the third.
They each represent the other 3 Gods of the world of One Piece with Akainu being the Earth God, Blackbeard as the Rain God and Imu as the Forest God.
In order to become the pirate King, Luffy and the straw hats will have to overcome those 3 obstacles to get to the top with Akainu and BB already being established as the main villains at Marineford, and now Imu is the third.