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He has two horns protruding from the sides of his forehead and stitches running vertically from the top of his face and down his neck, which is rather long and thick in comparison to his body. His ears and teeth are both pointed, while his lower body is relatively fat and stubby in comparison.
Moriah's hair is red and his skin is a pale blue, matching his lips, armbands and the edges of his gloves. His coat and gloves are black, while his pants are bright orange with pale window shapes imprinted on them. He wears a fishnet shirt underneath a cravat, a necklace, and a blue crucifix-like ornament with claw-like appendages sprouting out from three of the cross's points. During the meeting of the Shichibukai at the Marine Headquarters and later on during/after the war, Moriah added a fur-laced cape to his attire.
During Gol D. Roger's execution twenty-two years before Monkey D. Luffy set out on his adventure, Moriah looked much thinner and had a pointed chin.
In SBS Volume 63, Oda drew the Shichibukai as children, with Moriah gleefully pulling off the leg of a hapless ghost doll. His horns and hair were shorter, and he was missing the cross stitches running down the middle of his face. He wore a baggy, long-sleeved white shirt with suspenders and dark, knee-high pants. He also wore his usual long black gloves with cowboy boots with spurs and a jewel-encrusted dagger on his belt. He was also much thinner, and had a chin and longer legs.
He maintains a relaxed and laid-back stance at all times, seemingly appearing to believe he cannot lose. He also believes that a true pirate should fear nothing, not even death.
In most situations similar to fellow Shichibukai, Donquixote Doflamingo, Moriah is constantly grinning maniacally, and only seems to change expression when something bad happens to him or when he believes his power is being ridiculed. Like many others, Moriah has a distinct style of laughing: "Kishishishi".
In general, he prefers to avoid fighting altogether, or at least fighting his enemy directly, either making his shadow fight or ordering one of his subordinates to do so. His proclivity to delegate tasks to his minions is also a weakness in and of itself; Jinbe noted that Moriah had grown weak from his lack of training.
Moriah desires to become the new Pirate King, and believes that this is possible to achieve if he has powerful subordinates. Though he once claimed that he would rely on his own powers to achieve his goals, he is incredibly lazy; his motto is "relying upon others for one's own objective" (他力本願 tarikihongan?) and his favorite phrase is "You do it!!" (お前がやれ Omae ga yare?). This also extends to his fighting style, as he prefers to lay back and let his shadow battle with the powers of the Kage Kage no Mi.
He also appears to have considerable knowledge of the New World and how terrifying it is. At Thriller Bark, he told Luffy that with his current strength, he would lose his crew; his prediction came true before the Straw Hats went to the New World, at the Sabaody Archipelago.
Moriah has a lot of experience, having fought many opponents in the past, including a Yonko. He is a good battle tactician, being able to outsmart even Nico Robin. However, his overconfidence and laziness made him underestimate his opponents, and ultimately led to his defeat at the hands of the Straw Hat Pirates.
In the past, Moriah had many powerful crewmates whom he considered to be valuable comrades, and by his own admission was overconfident and headstrong. He also deeply cared for his crewmates, which was a point of tragedy when his last encounter with the Yonko known as Kaido ended with Moriah being the sole survivor of his crew. Shell-shocked and traumatized by the horrific event, Moriah immediately departed from the New World (having yet to return since), and decided that the only way he would not have to face such pain ever again would be to make his comrades unable to suffer by turning them into mindless zombies that serve only his desires. The loss of his crew to Kaido changed Moriah's outlook on life substantially, making him believe that subordinates are better off as zombies because, due to their undead status, they cannot be harmed by any physical damage - they can only be "purified" by the sea or elements of the sea and even if they were purified, he could easily find other shadows to reanimate them. In addition, creating a zombie powerful enough to defeat Kaido became one of Moriah's driving motivations.
Moriah is smart and strategic, demonstrating keen planning on multiple occasions. He often plans ahead with his zombies, placing certain shadows in certain bodies and altering the bodies to suit whatever his purpose would be under the circumstances. He apparently knows of the mechanics behind Bartholomew Kuma's ability to transport people elsewhere instantly, something that most people are not even aware of.
Moriah is a former Shichibukai, as well as one of the most experienced pirates in the entire Grand Line. At his prime, he was referred to as being a "rival" to Kaido, one of the Yonko (though eventually he lost his entire crew to the man). In Marineford, he was strong enough to battle Curiel, one of the division commanders in the Whitebeard Pirates, while sustaining no injuries aside from a strike he suffered from Jinbe (a fellow Shichibukai). He also managed to fell Little Oars Jr. in one move, though others had already injured the mighty giant beforehand.
Unfortunately, his tendency to heavily rely on underlings (or his own shadow) to fight for him in the battlefield may have contributed to his diminished prowess in single combat; often, Moriah would run away from or ignore an adversary if he deemed the battle as "pointless", as seen when he dismissed Luffy's challenge on Thriller Bark because he had already extracted the Straw Hat's shadow from him. Jinbe claimed that Moriah's dependence on absorbing the shadows of other people has weakened him.
After the Battle of Marineford ended, Donquixote Doflamingo claimed that the government had deemed Moriah too weak to continue to bear the title of Shichibukai and that he was better off eliminated; despite this, Mihawk recalls that Moriah was perfectly fine at the end of the war, it still took Doflamingo and a group of Pacifistas to corner him, and Moriah still managed to escape.
Moriah possesses considerable endurance, having gotten up immediately after attacks by Nightmare Luffy that toppled Oars and quickly recovered from a powerful strike from Jinbe to battle a commander of the Whitebeard Pirates.
Moriah is also fairly durable, as he did not take any damage when Nami's Thunderbolt Tempo struck Oars. Also, even though he was crushed under the main tower of Thriller Bark, only a small injury to his head remained after his recovery, as evidenced by his appearance at Marineford.
In addition to his considerable resistance to damage and fatigue, Moriah possesses impressive willpower; using Shadow's Asgard, he managed to sustain 1000 shadows within his body, though it did exert him greatly. His willpower also prevented him from being knocked out by Luffy's Haoshoku Haki at Marineford.
Moriah ate the Kage Kage no Mi, a Paramecia-type Devil Fruit that allows him to manifest and control shadows as physical beings. It is this fruit that allowed him to build his zombie army by depriving living beings of their shadows and implanting them in dead bodies. Moriah can have his own shadow, which he calls Doppelman, fight for him; in addition to being mostly solid and easily changing its form into things like tiny bats, Doppelman cannot be destroyed and will continue to reform. Moriah can switch locations with his shadow instantaneously, which he uses to dodge attacks.
Even if he has no zombies to do his fighting for him or shadows to increase his own strength, Moriah is a fairly strong fighter with just his own shadow, having used it to impale Little Oars Jr. through the chest.
The Kage Kage no Mi allows Moriah to steal the shadows of others. The theft of another person's shadow causes them to be vaporized if they come in contact with direct sunlight. Moriah can create a zombie by implanting a stolen shadow into a lifeless corpse. People who have their shadow stolen are left in a coma for two days and do not have reflections. If they die, the zombie with their shadow loses the shadow.
Moriah can place someone's shadow inside of someone's living body, increasing physical power and possibly granting them a fighting technique. Moriah can also grab multiple shadows and insert them into his own body for a power and size increase; the culmination of this is his last resort technique Shadow's Asgard, where Moriah absorbs the shadows from all of his zombies at once. On Thriller Bark, Moriah absorbed 1000 shadows at once, giving him a monstrous increase in both size and strength that allowed him to split his ship in half with one punch.