Koby

Haki.

Armament Haki

Koby is an extremely skilled Armament Haki user and is capable of the advanced technique of haki emission. He is strong enough to shatter Avalo Pizarro's gigantic island hand, which was roughly the size of a mountain. This feat sparked immediate astonishment from the Marines, SWORD members, and Blackbeard Pirates, some of which included Devil Fruit users and combatants who fought powerful opponents.

Observation Haki

During the Summit War of Marineford, Koby awakened Observation Haki and could hear in his head the voices of the combatants disappear as they were slain, which overwhelmed and sickened him. Without meaning to, he could sense the presence of everyone around him.

After the timeskip, Koby had developed his Observation Haki to a very advanced level. He was able to notice a torpedo headed towards the Dressrosa-Prodence Kingdom ship underwater from his own ship a ways off, shocking Helmeppo, who did not notice it despite his own Observation Haki. On top of that, Koby also managed to sense Kyros' great strength despite just meeting him

After his father's termination from the Marines, Helmeppo lost access to the luxurious life that he once held under his father's rank. He was forced to become a chore boy alongside Koby, and despite Koby's good-natured attempts to befriend him, he refused any of it. After being kidnapped by his own father and held hostage, Helmeppo disowned his father and started changing, becoming braver and less of a spoiled brat. Eventually, Koby and Helmeppo become close friends. Now they are working together. In addition, Helmeppo also deeply cares for Koby, and he rushed to help him after being defeated by Luffy.

After Koby had been captured by the Blackbeard Pirates, Helmeppo wanted to go save his friend as soon as possible, pleading with his superiors to do so.

Garp is the mentor/instructor of Koby and Helmeppo; he keeps them out of trouble and ensures that they are not slacking off. If they do get out of hand, he knocks them around to ensure they know their place. Koby admires Garp, even though he maintains a highly brutal clutch on him, because he would not be where he is without him. Garp was horrified when Koby shouted out to stop the massacre at Marineford during the Whitebeard War.

After Koby was captured by Blackbeard, Garp went to Hachinosu to rescue his apprentice, much to his shock and surprise that Garp and the rest came just to rescue him. Garp acknowledged Koby's potential and determination as he entrusted Koby to stop Pizzaro's devastating attack on the Marine Ship.

Much like Luffy, Koby contains and acts with selfless motives and compassion, being devoted to helping people, both civilians and his fellow Marines, unconditionally, which earned him immense popularity. He has run into people at Levely and bonded over shared admiration for the Straw Hat Captain, though Koby has attempted to deflect his own due to his station in the Marines.
Among the most determined and unbreakable people, Koby's drive to prove himself and become strong is unmatched by almost all of his compatriots. In the early days of his training as a Marine when he was still weak, he would train relentlessly non-stop by punching battleships, which could only be done by powerful Marines such as Garp and Kuzan, due to acknowledging his lack of fighting talent. Despite his already exhaustive training session with Garp, he continued to train on a

First introduced as the Alvida Pirates' hapless ship caretaker, Koby was a coward who lived in fear of both the ship's crew and captain. Two years of enslavement had robbed him of all hope of escaping as well as his dream of becoming a Marine, leaving him with few goals other than avoiding being bludgeoned to death by Alvida's iron mace. Luffy was less than impressed with Koby's cowardice, describing him as "pretty stupid and useless...and kinda wimpy too." However, Luffy's boundless optimism and single-minded pursuit of his dream rekindled a similar conviction in the downtrodden ship caretaker, allowing him to defy his captors, even under the threat of a brutal death by Alvida's mace.

Under Garp's instruction, Koby's cowardice and self-pity has been replaced with confidence and resolve, although he remains polite, self-effacing, and somewhat apologetic or timid if he feels he oversteps in his ambitions or station (such as publicly stating his goal to become a Marine admiral). He continues to be an emotional, compassionate person who can easily be driven to tears for a variety of reasons, which led to Zoro jocularly calling him a "crybaby" during their reunion at Water 7.[

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Koby was a small, timid, chubby boy with kobi pink hair and round-frame glasses. Due to the passage of time and Garp's training, Koby has grown thinner and taller and more better looking then before.

He has also gained a cross-shaped scar above his right eye, presumably earned under Garp's heavy-handed tutelage. His hair has grown longer and shaggier since his growth spurt, but it has retained its kobi pink color.
Koby wears a standard-issue Marine jacket, pants, and neckerchief as well as a brightly patterned bandanna worn tied across his forehead. Koby's glasses are still present, but he has adopted the habit of wearing them pushed up on his forehead, occasionally using them for reading.

He was formerly an involuntary pirate ship caretaker for the Alvida Pirates after the day he was kidnapped, until he was liberated by Luffy, being the first person Luffy befriended on his travels. He reunited with Luffy during the Post-Enies Lobby Arc, after becoming a fully-fledged Marine soldier. During the timeskip, Koby earned fame as a hero for his actions through the Rocky Port Incident.

Koby the is a Marine Captain who trained together with Helmeppo under Vice Admiral Garp's supervision for 4 years. He is currently a member of the Marine special forces unit SWORD.

Due to his status as a hero, the Cross Guild has assigned Koby a 5-star bounty, worth Beli 500,000,000.

He is Luffy's ally during the Romance Dawn Arc. He and Helmeppo are the central characters from the Diary of Koby-Meppo Cover Page Serial and supporting antagonists of the Post-Enies Lobby Arc. Koby is also a brief antagonist in the Marineford Arc.

After the timeskip, Koby has grown even taller, reaching Garp's shoulders. He now wears a scarf, a senior officer's Marine coat with the word "justice"on it