Monkey D. Garp

Monkey D. Garp is a marine vice admiral. He is the father of Monkey D. Dragon, the grandfather of  Monkey D. Luffy, and the adoptive grandfather of Portgas D. Ace. He takes charge of both Coby and Helmeppo's training. After the war, he became a Marine Instructor to new recruits.

Before the Great Age of Pirates
Monkey D. Garp is a Marine hero, who was famous for cornering and fighting the late Pirate King, Gol D. Roger numerous times in his career. Garp is considered by Whitebeard  as one of the few people that know the seas from the time of Gold Roger.A proof of his strength is that he was offered an admiral position many times from Fleet Admiral Kong, but he refused every time.

As part of his duty, in the past he chased other pirates like Shakuyaku, while nearly killing Chinjao.Roger asking Garp to protect Ace.Prior to Roger's execution, the Pirate King requested that Garp would take care of Ace, as he thought Ace did not deserve to be branded a criminal due to being born into a family of a pirate.

When Shiki the Gold Lion attacked Marineford a week before the execution of Roger, Garp and Sengoku challenged him together. After a grueling battle that devastated half the town, they managed to defeat him, and (according to a marine) Garp was left heavily injured. A number of months after the Pirate King's death, Garp protected Ace as Roger had hoped, and was present at Ace's birth that killed Rouge and afterward took Ace to a secret location to be raised by Dadan. Garp would visit Ace during his vacations.

Abilities and Powers
As a vice admiral of the Marine Headquarters, Garp had command over all lower ranking soldiers. An example of this is when after Morgan escaped, he was able to take away two of Ripper's subordinates (Coby and Helmeppo) and make them his own subordinates instead due to him having the higher rank. Also as a vice admiral, he had the potential to be called upon to be one of five vice admirals leading a fleet of ten battleships during a Buster Call.

Garp is one of the most powerful fighters seen in the series so far. Although rather old, Garp still possesses an incredibly high amount of physical strength. He is able to throw iron cannonballs as if they were baseballs (at faster than cannon speeds), break through brick walls and cannon stands with his fists, and both carry and throw a gigantic ball and chain many times bigger than the Thousand Sunny. Garp also has a monstrous punching ability at his disposal, with his epithet, "Garp the Fist," vouching for his punch strength.

In terms of combat, Garp has had several decades worth of experience in both combat and navigating the harshest oceans within the volatile "New World". He's also a "hero" of the Marines and as is known for cornering and fighting Gol D. Roger many times. Roger also stated that he and Garp had almost killed each other on numerous occasions. As another true testament of sheer power, Garp defeated and nearly killed off Don Chinjao in the past, whose bounty was worth around 500,000,000 in his prime and was said to be able to split a continent with a headbutt.

He also has leadership skills, being a Marine vice admiral and the commanding officer of the 153rd Marine Branch.

In addition to his legendary strength, he has incredible durability and pain-tolerance, as seen when he was slashed by Captain Morgan's axe hand, only to recover only seconds later, with no obvious pain and apparently being oblivious to the fact he was struck at all. This was due to the fact he fell asleep before he was being attacked. He was able to get back on his feet after being punched by Luffy in Gear Second at point-blank range without losing consciousness (the punch was made possible only because Garp allowed Luffy to land the strike) and was still able to fight the Blackbeard Pirates along with Sengoku.

He has also been shown to be extremely fast as he managed to bypass all of the Straw Hats in order to get to a sleeping Luffy. It is evident Whitebeard respects Garp's strength as he mentioned him during his talk with Shanks. It should also be noted that Garp is not seen to carry any weapons, aside from the cannonballs that he throws, which implies that he is most likely a hand-to hand fighter. Another example of Garp's strength is when he shown to easily strike down Marco of the Whitebeard Pirates despite having his Devil Fruit abilities activated at the time, knocking him back which was something that Kizaru and Akainu seemed unable to do.

The extent of Garp's power and fame is evident round the time of the Battle of Edd War, three years before the future Pirate King died. It was revealed that he was offered the rank of admiral more than once, but repeatedly refused the promotion. Garp's subordinate at that time, Kuzan (later promoted to admiral), commented on how cool Garp was for refusing such an irresistible promotion to which he answers by stating that he does not need a higher position, and that it would reduce his liberty to do what he wants. While being officially ranked as a vice admiral, his power was once or still is enough to qualify him for the rank of admiral or even fleet admiral before he retired.

Similarly, when it was revealed worldwide that Luffy is Garp's grandson, Luffy's fame rose based on that fact alone, as Demaro Black attempted to use that as one of the strong points in his impersonation of Luffy, and Charlotte Linlin referenced to Garp when Luffy challenged her. He is a great teacher as he was able to make Coby and Helmeppo capable fighters in a short period of time and he was also selected to be an instructor. He was also the one who trained Luffy and Ace into being strong enough to set sail on their own.

Haki
Aside from his incredible mastery over Busoshoku Haki, Garp is also very knowledgeable of the other two types. Although not demonstrated to be a user of the other two types, Garp commented that Luffy has "inherited" Haoshoku Haki when it was subconsciously released. When Coby seems to have awakened Kenbunshoku Haki on his own, Dr. Fishbonen recommended that Coby ask Garp how to master it, suggesting he has enough expertise in it to mentor others.As a vice admiral, Garp is fully capable of using Haki.He demonstrates proficient usage of Busoshoku Haki, being able to injure Luffy several times, bypassing his rubber body He was also seen crushing Chinjao's uniquely shaped head with a Haki imbued punch 30 years ago, by hardening his fist and turning it obsidian black to increase the damage inflicted.During the Battle of Marineford, he managed to punch and hurt Marco despite his regenerative phoenix form.

Weapons
Garp preparing to throw a giant iron ball.So far he's been seen throwing cannonballs (including a giant one, mounted on a chain) with his bare hands. The cannonballs he threw soared at a faster velocity than when fired out of a cannon, due to Garp's monstrous strength.

Attack List

 * Ai aru Kobushi (愛ある拳 Ai aru Kobushi, literally meaning "Fist of Love"): A simple but powerful punch to strike Luffy on his head, imbued with Busoshoku Haki to hurt him. It's a gag technique to "show" his love for his grandsons. He's been shown to have used this on Ace during his childhood as well. In the FUNimation sub, it's called Fist of Love.
 * Genkotsu Meteor (拳骨隕石（メテオ） Genkotsu Meteo, literally meaning "Fist Meteorite"): Garp throws a cannonball at an enemy ship. Due to Garp's superhuman strength, he can throw them like baseballs, and the impacts are more powerful than when being fired from an actual cannon.
 * Genkotsu Ryuseigun (拳骨流星群 Genkotsu Ryūseigun, literally meaning "Fist Meteor Shower"): Garp throws one thousand iron cannonballs at enemy ships. The cannonballs are supplied by conveyor belts on either side of him. In the FUNimation subs this is called Meteor Fist Shower.