Japanese Name: ヘルメッポ
Romanized Name: Herumeppo
English Name: Helmeppo
First Appearance: Chapter 3; Episode 2
Affiliations: Marines, Marine 153rd Branch (former)
Occupations: Marine Chief Petty Officer, Chore Boy (former)
Japanese VA: Kōichi Nagano
Odex English VA: Brian Zimmerman
4Kids English VA: Sean Schemmel
Funi English VA: Troy Baker (Episode 2-3);
Mike McFarland (Episode 68+)
Birthday: July 16

Chief Petty Officer Helmeppo (ヘルメッポ軍曹 Herumeppo Gunsō?) is Morgan's son. Once a spoiled child who took advantage of his father's status, he is now a Marine chief petty officer under the command of Vice Admiral Monkey D. Garp and partnered with Master Chief Petty Officer Coby. Due to his actions, he can be considered the secondary antagonist of the Captain Morgan Arc .


When Helmeppo first appeared, he was a skinny and lanky-looking young man with light blond hair shaped like an oval on top of his head.

Originally, he wore snappy violet colored uniforms with white shoes and a rubber band ring on his left hand while his father was still in power. After his father Morgan was defeated, he wore a standard marine "cabin boy" uniform. But after his extensive training with Garp, he started wearing a white shirt with a pale green vest over it, purple pants, a black pair of gloves, and a rather odd looking pair of sunglasses.

He also now has longer hair tied back into a ponytail as well as having a more muscular appearance compared to his original look.


Helmeppo before Garp's training.
Helmeppo Manga
Helmeppo in the manga, during the Battle of Marineford.


Helmeppo was a coward who hid behind his father's wealth and power. Having a father who was powerful and greatly feared, he came to shun other people and see them as lower than himself. Whenever someone disagreed with him, he'd threaten to tell his father on them and have them killed. Though he was nowhere near as bad as his father, as Helmeppo became horrified when Morgan ordered him to kill a child. Despite this, Helmeppo loved his father and thought his father loved him back, until Morgan hit him after he gave him an order to kill Luffy who had punched him, at which reveals that Morgan thinks of Helmeppo as a worthless son who is not even worth hitting.

After his father was kicked out, he lost access to all the luxurious life that he once held under his father's rank. He was forced to become a Chore boy alongside Coby and despite Coby's good nature and attempts to befriend him, he refused any of it. Part of him was still loyal for his father and when it came for him to be taken away, he was seen crying because his father was about to be killed. 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, after one event or another, he and Coby become good friends.

By the events of Water 7, Helmeppo is a changed person, now even referring to himself as "that bratty selfish son who lived off his father's status". Now a chief petty officer alongside Coby, he continues his training in the Marines. His appearance has changed with his hair having grown to his shoulders and he now wears a pair of sunglasses. He was deeply (and comically) upset when Zoro and Luffy did not realize who he was and seem equally upset when they did not say goodbye to him either.

Despite everything, Helmeppo seems to be more level headed than Coby when it comes down to analysing situations, Coby being the more aggressive of the two.

Abilities and Powers Edit

Weaponry Edit


Helmeppo's dual Kukri.

Having trained alongside Coby in the Marines, Helmeppo has gained some measure of fighting ability. Helmeppo's weapons of choice are a pair of kukri, which he keeps at the back of his waist with his belt. He was seen using them against Zoro when they met again in Water 7. However, he was still no match for Zoro.


Living Under a Father's Shadow and Entering the DangerEdit


Helmeppo as a spoiled child.

Helmeppo was Morgan's bratty son who lived off his wealth. He unleashed his wolf, Soro on the townsfolk of the nearby town one day and Zoro killed it to defend Rika. In anger, Helmeppo had Zoro arrested for killing his pet, on the agreement that he had to go without food or water for one month and he would be allowed to go free.

Helmeppo caught Rika trying to give Zoro food twenty days later. He had her tossed over the wall of the Marine base after stomping on some Onigiri she had made (though luckily, Luffy catches her). Later, Luffy overheard heard him bragging about going back on his promise to Zoro and Luffy hit him.

Helmeppo ran back to his father to get him to kill Luffy only to have his father hit him for giving him orders. When Luffy invades the base to get back Zoro's swords, he uses Helmeppo as an unwitting guide and shield against the marines that come after him till Helmeppo faints. He is later seen holding Coby hostage in an attempt to stop Luffy from beating his father. The attempt fails however and he is taken out with a punch from Luffy.

Morgan escape

Morgan takes his own son as hostage.

After Morgan is defeated, he does petty work for the Marine Base in Shell Town along with Coby. At first, Helmeppo was furious at the loss of a luxurious life, and rejects Coby's attempt to befriend him, as well as crying over his father's imprisonment. However, later, when Morgan escaped and took Helmeppo as hostage, the latter starts to warm up to Coby and eventually becomes his friend after disowning his father (Coby had also saved his life by keeping the Marines from firing on the boat Morgan and Helmeppo were on).


Helmeppo and Coby under Garp's surveilance.

During such time they meet Vice-Admiral Garp, who takes them to his own base on the Grand Line to watch over and helps guide their progress. From Garp's brutal training, Helmeppo becomes skilled in the use of kukri, though Zoro still takes him down without any difficulty. He's far less arrogant than he used to be (even referring to himself as "that idiot who paraded on his father's power").

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