Due to his actions, he can be considered the main antagonist of the G-8 Arc.
Jonathan is an orange-red haired man with brown eyebrows and mustache. Although he is the base commander, he is typically not in uniform, but dresses very casually. When in uniform, he wears a typical Marine overcoat with several decorated medals. Unlike many vice admirals, he does not wear the standard Marine cap, but rather wears a feathered tricorne.
Despite his position as a Vice Admiral, Jonathan is shown to be mostly easygoing and laid-back among his fellow Marines, and good-natured because he cares deeply for his base and the men under his leadership. While he is use to relaxing and takes up fishing for a hobby, his wife Jessica keeps him in check from slacking off on his job.
Nonetheless, Jonathan is proven to be one of the most tactical Marines with an eye for strategy, which shows by his aptitude for the game of chess. He is also known to be analytical and observant of his enemies and can predict their movements by way of studying their character.
After the Straw Hats escaped, he reveals that he had no aspirations of capturing the Straw Hats and merely saw their appearance as a way of bringing his soldiers together and proving to Marine Headquarters that the G-8 base was still important and did not deserve to be decommissioned.
He also severely dislike vegetables and says "nah" at the end of his sentences on occasion.
Jonathan has a loving relationship with his wife, Jessica. Though he gets special treatment when it comes to meals, he unfortunately does not like the meals personally prepared for him by her as they contain a lot of vegetables. He however cannot refuse her cooking. As a result of his wife's somewhat command over him, his base has a bunch of rules that pertain to eating, such as not leaving any left overs and brushing your teeth after meals.
Drake is his right-hand man. Although they don't always share the same views of perspective, Jonathan respects his fellow officer nonetheless.
Though he is said to be Sakazuki's protege, he has conflicting morals with his mentor. Sakazuki is a believer of Absolute Justice who is willing to kill even civilians if it would uphold the peace, whereas Jonathan is more of a believer of Moral Justice who is willing to show mercy towards criminals, depending on the situation.
Straw Hat PiratesEdit
After the Straw Hats landed in his base after their adventures on Sky Island, Jonathan aimed to capture them. He did not despise the crew and he even came to respect them for managing to elude him for so long. Even though the Straw Hats managed to escape, Jonathan did not hold a grudge against them. Instead, he was glad that their presence was what united the Marines in G-8.
Abilities and PowersEdit
As a Marine vice admiral, Jonathan is capable of commanding a Buster Call alongside four other vice admirals. As the commander of G-8, Jonathan commands the entire base and all of its Marines stationed there. Jonathan is a skilled thinker and strategist who prefers to outplay his enemies rather than directly confront them. Also, being a vice admiral suggests that he is extremely powerful. He is capable of deducing things that his men do not immediately figure out when given the right clues and can creatively strategize to outwit his enemies.
Apart from his abilities as a Marine, he is also a skilled fisherman. With his rod, he can snag and reel in other people with just its hook. He is also an avid chess player, which has helped him plan out his moves.
- Further information: Haki
Sky Island SagaEdit
While fishing one night, Jonathan noticed the Going Merry fall from the sky into the middle of G-8. Seeing this, Jonathan and the rest of the Marines immediately started investigating the ship. Upon searching the ship, Jonathan and the other Marines found it to be completely deserted. From this discovery and from eye witness accounts of strange happenings like the sight of a furry monster and hands suddenly appearing, the entire base suspected it to be a ghost ship. Jonathan however suspected otherwise.
Finding some clues left on board by the Straw Hats, Jonathan deduced that the ship was not haunted and had recently been to Jaya. Upon deducing this, he however did not denounce the rumor of the Going Merry being a ghost ship as to not alarm the base. He then instructed his head officers to fortify the base's defenses and to search places where people might gather. Jonathan suspected that in light of current events, the pirates would probably disguise themselves as Marines in order to avoid detection.
As events unfolded, Jonathan found Roronoa Zoro and had him imprisoned. With his men busy interrogating this captured pirate, Jonathan decided to head to the mess hall to investigate and to have well deserved meal. As he was eating, Jonathan had a chance encounter with Luffy and Sanji disguised as chefs. Having discovered these two pirates, Jonathan and his wife, Jessica, attempted to capture them. They unfortunately could not catch them due to some of the Marines coming in for lunch.
As events continued to unfold, Jonathan was informed of a long nosed man that his men found. Suspecting that this man might be the special inspector that the Marine Headquarters sent on the Stan Malay that arrived earlier, Jonathan did not immediately imprison Usopp right away. He however imprisoned him when the actual inspector Shepherd came. Though the inspector arrived, Jonathan however suspected that this woman was not the real inspector either. Going by the reports of unidentified personnel and his encounters with the Straw Hats he met, Jonathan deduced exactly who they should be looking for.
After some time without much incident, Jonathan decided to lay a trap for Luffy and his crew. Knowing that Luffy would most likely try to rescue his imprisoned crew mates, Jonathan set an ambush in the brig. Though Jonathan was able to direct Luffy's path into the brig, the pirate and his crew mates were however able to escape the trap. As the incident further ensued, Jonathan felt that normal tactics would not work on the Straw Hats. Knowing that the pirates would be heading to their ship and to prevent further needless damage to his men and the base, Jonathan decided to lay an ambush in the dock where the Going Merry was kept.
Though Jonathan directed his forces to ambush the pirates in the dock, his men however would still need time to reach the dock before the pirates. Knowing that the Straw Hats would have cross the Straw Bridge to reach the docks, Jonathan decided to set an ambush on the bridge in order to delay the pirates while the rest of his men were preparing. For this task, Jonathan reluctantly ordered the Marines of Unit 55 to engage the pirates. Though the ambush ended with part of the bridge being destroyed by Luffy, Jonathan's plan however worked in delaying the pirates and giving his men enough time to set positions in the dock.
The ambush in the dock however went awry due to unforeseen factors and the Straw Hats were able to escape on their ship. Jonathan however knew ahead that something like this would happen so he had all the Straw Hats' gold confiscated while the Going Merry was still in the Marines' possession. Knowing full well that the pirates would not leave their precious gold behind, he knew right away that the Straw Hats had not left the base when it was reported that they somehow escaped undetected. Though he guessed correctly that they would be hiding in one of the abandoned docks, Jonathan decided to let the pirates make the first move.
Guessing that the Straw Hats would probably search for their gold in Navarone's vault, Jonathan had the gold moved to his room and stationed some of his men to ambush the pirates there. Due to the incompetence of the real inspector Shepherd however, Jonathan's plan to catch the Straw Hats in the vault failed. Furthermore, Luffy and Nami were then able to successfully infiltrate his room and escape with the gold. Despite the Straw Hats reclaiming their gold and successfully deceiving the Marines in their rather crude disguise of their ship, Jonathan was not worried. His last resort strategy to catch the pirates was coming in fruition.
Knowing of what happens at 9 o'clock pm at Navarone, Jonathan was able to stop the Straw Hats dead in the shallows when the water surrounding the base subsided. Having placed them in a dire situation, Jonathan gave them the ultimatum for them to surrender. Since Luffy and Zoro were the only ones that had bounties at the time, Jonathan promised the Straw Hats that only these two would be sent to headquarters, and that the rest of the crew would be spared. Despite having completely trapped the Straw Hats this time around, Jonathan still had his doubts. Though the Straw Hats could not cross through land or sea, the path in which they entered the base in the first place was still opened.
Sure enough, Jonathan's predictions came true. The Straw Hats were able to escape G-8 via a Balloon Octopus and some Dials. Though the pirates had completely escaped Navarone and eminent consequences of having failed to capture them would come, Jonathan however reassured his wife that the Marines still fulfilled their job. Knowing full well of what the rest of the Marines were saying about the base, Jonathan used this opportunity to show them what Navarone was capable of and that there are indeed pirates like the Straw Hats that require the attention. As a result of this incident, Jonathan also commented that because the Straw Hats' intrusion into the base, everyone in Navarone was able to unite.
Summit War SagaEdit
Amazon Lily ArcEdit
Jonathan appeared again in the anime, when he was seen alongside with Drake, during the gathering of Marines in Marineford in preparations for the war against the Whitebeard Pirates. However, he was never seen throughout the whole war even after Luffy, whom he previously met back at G-8, arrived.
One Piece Film: ZEdit
- According to Konosuke Uda, he is named after Jonathan Livingston Seagull.
- In the anime, his name is written as "Jonnasan", rather than the commonly transliterated "Jonathan". 
- Although he is a non-canon anime character, Jonathan and his two subordinates, Drake and a chief petty officer, were among the Marines present during the gathering of Marines at Marineford in preparation of the Whitebeard War. But he was not seen fighting or made any other appearance in the ongoing of war, so this appearance is considered as a simple cameo. He also makes cameo appearances in the non-canon films One Piece Film: Z and One Piece: Stampede.
- Jonathan is one of the few antagonists that Luffy never fought directly, instead competing in a series of tactical maneuvers, although Luffy's other crewmates were the only serious opposition.
- He is currently the second highest-ranked non-canon Marine, with Z being the first (although Z was no longer a Marine when he appeared).