The captain of the crew, Simon, possesses a Logia Devil Fruit that makes him a formidable opponent. The crew also contains a good range of members, in both profession and skills that make them challenging.
Big Secret Treasure of the Seven Phantom IslandsEdit
When the Straw Hat Pirates crash-landed on the Seven Phantom Islands due to a storm, they eventually encounter the Simon Pirates. In various RPG battle, the Straw Hat Pirates eventually managed to defeat the entire Simon Pirates and leave the island.