While many other characters have a younger generation counterpart in One Piece, who will follow in Sengoku's footsteps?

Although the One Piece manga hasn't revealed Imu's identity yet, the story is already setting up their biggest opponent.

At the beginning of One Piece, Sengoku is the Fleet Admiral of the Marines, and the leader of one of the Three Great Powers. In the previous era, Sengoku was one of the strongest men in the world ...