After joining the Marines, Coby knew that he had to train a lot in order to accomplish his dream of becoming an Admiral. Fortunately for Coby, he was taken in by
Koby (コビー, Kobī) is a Navy officer who trained together with Helmeppo under Vice Admiral Garp's supervision. He was formerly a cabin boy for the Alvida Pirates until he was liberated by Luffy, and was one of the first people Luffy befriended on his travels.
Coby and Helmeppo are mentored by Vice Admiral Garp in becoming marines. Coby and Helmeppo are mentored by Vice Admiral Garp in becoming marines.
Vice Admiral Garp mentors Koby and Helmeppo to become strong marines. He invites Koby and Helmeppo to join in Marine Headquarters. Koby and Helmeppo decide to train for their dream, which is inspired by their friend Luffy. Koby and Helmeppo train harder in order to become stronger.
Helmeppo continued his tomfoolery until his father was taken down by Luffy. Subsequently, Helmeppo joined the Marines and was pitted along with Koby. Monkey D. Garp trained the two recruits personally, and they became a lot stronger.
After joining the Marines, Coby knew that he had to train a lot in order to accomplish his dream of becoming an Admiral. Fortunately for Coby, he was taken in by Garp, who trained him rigorously. Under Garp's tutelage, Coby became stronger, and he was able to learn Soru, and he used it a couple of times against Luffy.
Koby has Observation and Armament Haki. Koby's Honesty Impact uses Armament Haki in a similar way to Garp's Galaxy Impact, except Koby's version is less powerful and is based on Armament Haki only, without Conqueror's like Garp.
During the Summit War of Marineford, Koby awakened Kenbunshoku Haki. Koby was shown hunched over and crying intensely on the battlefield, saying that the voices in his head were disappearing one by one as the combatants around him were slain, much like what Aisa felt during the Skypiea Arc.
So far, the crew has been responsible for the deaths of Whitebeard, Ace, and Absalom, which shows that they wouldn't hesitate to kill Koby for their needs. However, one thing to keep in mind is that the crew only hunts devil fruit users, and Koby does not possess one.
Garp bears a grudge against Shanks, because Garp believes he is the one who influenced his grandson, Monkey D. Luffy, to become a pirate.
Well, the answer is simply because he doesn't want to have anything to do with the Celestial Dragons. After all, Admirals of the Marine have to answer directly to the Celestial Dragons, and have to quickly come to their aid whenever they encounter a problem. To Garp, that is the definition of a nightmare.
Garp is known to possess immense Haki and as fans know, he does not have a Devil Fruit ability. As such, fans will most likely see the level of his Haki power in the upcoming chapters of the story where he clashes against Yonko Blackbeard.
Thanks to his training under Garp, Koby seems to have mastered all the Six Powers, which makes him quite a formidable enemy for any pirate right now.
In One Piece 1059, it was revealed that Blackbeard had captured Captain Koby of the Marines for some reason. The Navy made this known to the headquarters near the Red Line and the newspapers carried this message as well. By the looks of it, Koby is the only member of the Marines who Blackbeard captured.
If Koby and Hancock do fight, it will likely end in the defeat of the former as he is certainly not up to the level of the Pirate Empress.
Coby is a current Rear Admiral and a member of the secret Marine unit, SWORD. Coby is one of the Marines whose had the privilege of being personally trained by the legendary Marine Hero.
The Hito Hito no Mi, Model: Nika is an incredibly powerful Devil Fruit that belongs to Luffy, also known as the Sun God Nika. Luffy has a godly ability since he is the Sun God.
It is possible that Blackbeard consumed the Inu Inu no Mi, Model: Cerberus, a Mythical Zoan-type devil fruit. Since Cerberus is known for having three heads attached to the same body, it would explain how Blackbeard managed to eat two more devil fruits, one for each head.
As fans know, Nami doesn't wield any form of Haki in the story so far. Haki is a power that Rayleigh described to be the manifestation of the user's spirit. Every person in the One Piece world possesses Haki, however, not everyone is able to bring this latent skill out.
Sanji is an extremely skilled Haki user. During the two years he spent at Maiden Island, he trained his usage of both Armament and Observation Haki. Unlike Zoro and Luffy, Sanji wasn't taught this skill by anyone. He managed to learn all by himself and that is certainly an incredible feat.
A former Shichibukai, Crocodile is a veteran pirate who, surprisingly, didn't have Haki when he fought Luffy in Alabasta. Despite that, Crocodile is an extremely powerful pirate who relies heavily on the power of the Logia-type Suna Suna no Mi.
Like his grandsons Monkey D. Luffy and Portgas D. Ace, Garp is one of the very few people in the world who can use all three types of Haki. He is also a capable teacher, as he taught both Koby and Helmeppo.
Shanks is the first character in the series to use Haoshoku Haki. In fact, he was the first character to show any form of Haki, in the first chapter no less.