Ron Tobi known by his Mask Alias Nelix is the Tactician of the Straw Hat Pirate he join the Luffy crew so he would remain conceal from the World Government Tobi was working for World Government at an young age when he lost his Family to Pirate and serve as an assassin in CP9 but accuse by the Gorosei of false crime due to not showing true loyalty to the Government and became wanted and gain a bounty of 96,000,000 Beli he later decide to use an Public Persona so the Straw Hat would not betray him and remain conceal but he became attach to Luffy crew and shock how different Luffy and Hayate is from other Pirate later choose to remain with them when they were willing to challenge the World Government