Jonathan Arleigh/Tropes

Revenge Fic and You Killed My Father!
Jonathan's original reason to set sail as a pirate is to avenge his father from those who, he believes, killed him. By doing so, he needs to stop the Right Wing and defeat its leader. However after he and his crew defeated them, he chose not to end their rule and have the Marines to take charge of the now disbanded group.

With the reintroduction of his father after the timeskip (which only up to date appears in character articles and no story to support), he then chose to acquire his father's dream to sail around the world and be the Pirate King.