Personally, I think it is definitely Kirby. First of all, he is the fastest growing. Secondly, he agreed with Luffy that Luffy would sit in the position of general.

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　　I feel in my heart that Kirby was the first to become a navy general.

　　Kirby is a character who appeared in the first episode. He was still a handyman on the boat in Alvida. It was Luffy who saved Kirby from Alvida. When Kirby first appeared, he was really a short winter melon. He had neither face value nor strength, but later he studied with Lieutenant General Karp of the Navy Headquarters. Under the guidance of Karp, Kirby's progress was very obvious. He was not only promoted soon, but also his strength was impressive.

　　Smoker is now the lieutenant general of Naval Headquarters, and he is the ability of the devil fruit and smoke fruit in the natural department. Smoker was the first really difficult man Luffy met. He showed overwhelming strength when he first appeared in Rogge Town. Luffy was not domineering at that time and had no idea about the elementalization of Smoker. If the dragon didn't appear in time, Luffy would have been sent to the submarine prison by Smoker. Smoker was also very outstanding in the last war. He directly pushed Luffy to the ground with his weapon. If the fragrant feet of the female emperor were not used in time, Luffy would have been captured. But now Smoker's strength is completely out of sight. When he came out again two years later, although he was handsome, his strength was surprising. He was basically easily killed by Luo and Duo Flamingo. If the pheasant didn't appear in time, Smoker would have died of the fruit of Ming's thread. Originally, Smoker followed the green pheasant, but now the green pheasant is no longer a navy general, so Smoker's backer has collapsed.

　　Drake is one of the supernovae in Shamaodi Islands. Drake is in the form of Tyrannosaurus Rex, the fruit of an ancient animal dinosaur. When he appeared in Shamaodi Islands, he was kicked off by Kprusoian, just as two other supernova killers, Kira and the strange monk urqui, fought each other, so they went to Indiana and said that they would go to the new world to make trouble again. The two supernovae heard the words and chose to stop. Against Kprusoian and pacifists, the ability to show for the first time was amazed by three supernovae around. It is called by the supernova Haiming Apu: an ancient animal species that is rarer than the natural system. With three supernovae, urqui, Apu and Hawkins, they fought against Kprusoian, the general of the navy headquarters, and the pacifist. They were shot in the abdomen by the pacifist first, and then kicked in the face by the general Kprusoian. After being knocked down, they left Shampoo Island and entered the new world. After the Malinvando incident ended, he led the Pirate Corps to the new world two years later. A Dongdao territory belonging to the "Four Emperors" Kaido joined the Pirate Corps of Animals more than a year before the World Conference was held, and it became a new "pillar". Drake, the national article of Harmony, appeared in the form of man and beast, together with Peggy Wan, another person in the "Six Sons in the Air".

　　There is still a certain gap between Kirby's current strength and Smoker Drake's, but with Kirby's efforts, he will certainly surpass Smoker Drake in a short time. After all, Kirby's backer is Karp, who is a hero of Naval Headquarters and a big backer that stands firm. In addition, Kirby usually has Karp training, and his strength is also advancing by leaps and bounds. Oda positioned Kirby as a navy general, and when Luffy became the One Piece, Kirby was not far from the position of the general.

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