Menthuthuyoupi

Menthuthuyoupi is a character from the Hunter x Hunter anime and manga.

The third and last of the Royal Guards to be introduced, Menthuthuyoupi, or Youpi for short, is mostly human and shark. He is the dumb muscle of the bunch and considerably less intelligent than Pitou or Pouf. Nevertheless, the sheer force of his attacks mor than makes up for his ineptitude at strategization. He doesn't do much until the East Gorteau palace comes under direct attack, where he stands in a room getting bored. Knuckle, Meleoron, and Killua takes him on and attempt to kill him via attrition and Knuckle's ability. This is where he reveals his ability, rage-induced strength. The more frustrated and exasperated at his foes he becomes, the stronger and bulkier he gets. He gets so big and bulky that he unintentionally shifts forms once more into a weird horse-like creature with his face on the side. In this form, his rage goes from wild to calm, and he decides to no longer fight Knuckle and the others, choosing instead to just go straight to the King. He meets up with Shaiapouf on his way, finds the King, and allows the King to absorb himself into him, adding Menthuthuyoupi's strength to his own but turning him into a chibi much like Pouf. He's soon accosted by Welfin, but he dies from radiation poisoning before Welfin can even touch him.

In the XP4 fics, Menthuthuyoupi made his debut in XP4 Heroes Coalitions - Mission Chronicles.

Appearance
Menthuthuyoupi was the least humanoid of the King's Royal Guards, yet his physical appearance was loosely human. He had a bulk musculature and manly frame, but with irregularly shaped ears, animal-like legs with feet initially depicted to be claws of three digits which were later revised to two digits and of round toes (the 2011 anime adaptation only used the latter design), and razor-sharp teeth. He had dark red skin and short black hair slicked back on his head. Menthuthuyoupi had prominent facial bones and would constantly squint his eyes. He was the largest of the Royal Guards and scarcely clothed, only wearing a pair of skintight black pants. In the manga, Menthuthuyoupi was also briefly seen wearing a cape, which he would discard after the birth of the King and learning flight for the first time; while in the 2011 anime adaptation, the cape was never shown.

Whether it was his natural or Nen ability, or a combination of the two, Menthuthuyoupi could transform his body and had adopted various other forms beyond his default throughout his appearances. Depending on the situations at hand, he had on occasions significantly altered his body mass and ratios, grown wings, given himself extra eyes, granted himself additional limbs and morphed them into tentacles, burst spikes out of his body, expanded into a lump of almost-unrecognizable mass that seemingly consisted entirely of faces, as well as achieving a centaur-like form. After feeding most of his body mass to save Meruem, Menthuthuyoupi had greatly shrunk in size, becoming a vastly smaller version of his original form, with a pair of wings along with a rugby helmet.

Personality
Menthuthuyoupi was the most straightforward of all the Royal Guards and possesses a strength that comes from his lack of an ego. He was a Chimera Ant without an iota of human genetic material within him, caring less about his identity as an individual. He was quick to cease unnecessary thought, focus on prioritized goals, and acted upon his instincts—allowing him to be completely selfless and devoted to the King. However, his simplicity was both a boon and a burden. His belligerent, vehement, capricious, and irascible nature made him a fine, yet a variable soldier. His naïvety contrasted the eccentricities of his fellow Royal Guards, much to Menthuthuyoupi's confusion.

However, Menthuthuyoupi began to mature and change during his battle with the Hunters, Shoot, Morel, and Knuckle; and he began to act selfishly which was contradictory to his nature. He began to rapidly "mature" during the battle, becoming a cunning strategist who uses his rage at the ideal moments. At the end of the battle, Menthuthuyoupi had matured to the point where he reached his "Rage Incarnate" form and was even "thankful" to the Hunters in helping him achieve this form. Because of this, he gained a level of mercy towards others and spared the life of enemies which he would have killed in the first place without a second thought. Thus, Knuckle lost the drive to fight him since he could no longer see Menthuthuyoupi as a villain.

Like Shaiapouf, Menthuhuyoupi was not fond of Komugi, although he did not possess the same burning hatred for her as Shaiapouf did. He was perfectly willing to kill her if her existence proved to be a burden to the king, and when Meruem lost his memories, he agreed not to tell him about Komugi to preserve the bond they had created with Meruem.

Abilities
As a Chimera Ant Royal Guard, Menthuthuyoupi is an immensely powerful being. Colt believed him to be capable of defeating Chairman Netero, considered the world's strongest Hunter in his prime and by some the most powerful Hunter even in his old age. He was able to fight Shoot, whom he put in critical condition in less than 20 seconds of combat, Knuckle and Meleoron at the same time, with them having prepared tactics in advance and also receiving help from Morel and Killua, and had the chance to kill the former four while suffering next to no damage from their attacks, although they came close to forcing him into a state of Zetsu through Hakoware. According to him, none of the members of the Extermination Team he encountered had so much as a tenth of his raw power. He is such a fearsome opponent that Meleoron believed Hakoware to be the only chance the Extermination Team had to beat him. In his original form, he relied on his shapeshifting ability, a possible heritage of his Magical Beast genes, tremendous brawn and durability in battle. His fighting style changed after his first transformation, leading to him making use of his speed and blade-like arm as his primary means of offense. After donating most of his cells to Meruem, he was forced into a much smaller form with little combat potential.

Menthuthuyoupi's lack of human genes initially made him more selfless than the other two Royal Guards. This resulted in his loyalty to the King endowing him with unwavering focus and the ability to calm down quickly when upset. However, his tendency to get agitated easily and low strategic aptitude often made him easy to outwit.

Unfathomable Strength: Menthuthuyoupi boasts incredible physical strength, which he can enhance with his aura. He can also shapeshift to increase it even further. He can knock down walls with a single punch, while each of his whip-like limbs can shatter rock. One of his regular-sized arms could stop a swing of Morel's pipe from one of his smoke puppets. With a giant one, he completely destroyed a massive staircase with a single blow, and the shockwave caused the whole palace to shake. With a double strike to the ground, he created a crater and caused the whole tower to collapse. The first time he sprouted wings, a single flap had enough strength to drive him through the wall of the nest.

Enhanced Speed and Reflexes: Menthuthuyoupi has great attack speed, relentlessly assaulting Shoot with swift tentacle strikes and not leaving Knuckle an opening to attack while he dispatched Morel's Smoke Troopers, five of which he could wipe out in the blink of an eye. He noticed the Extermination Team, shape-shifted and destroyed the central staircase in 3 seconds. However, despite the superiority in range, he was not fast enough to catch up to Knuckle as he ran away. In his centaur-like form, he became much faster, moving fast enough that he passed Knuckle by before the Hunter could react.

Immense Durability: Menthuthuyoupi survived a tail strike to the head from Meruem with only a bruise, although the latter was not attempting to kill him. He suffered multiple powerful blows and electric shocks from Killua with no visible damage and walked into the incandescent crater left by the detonation of the Poor Man's Rose, coming out uninjured.

Keen Intellect: Though not his specialty by any means, Menthuthuyoupi has some analytical skills. He was able to figure out how his explosions work and control them shortly after using them for the first time. He thought about creating an opening for Knuckle to attack him in order to find and counter him, and later deduced that one of the enemies had the power of invisibility, not teleportation as he had originally assumed.

Empathic Bond: After being consumed by Meruem, Menthuthuyoupi began to share an empathic bond with him that allowed him to sense the King's confusion resulting from his amnesia.

Nen
Menthuthuyoupi is an Enhancer. Like the other Royal Guards, he was born with the innate ability to see aura and use Nen. Knuckle was unable to sense the limit of his aura and estimated him to have at least ten times Morel's aura amount, so a minimum of 700,000 aura units. He also boasts a tremendous output, exceeding even Isaac Netero's, so that an accidental blow from one of his tentacles returned Knuckle enough aura to pay off most of his first blow plus interests. Knuckle estimated that a real punch from him would possess enough power to pay back a loan of about 7,000 aura units and still retain enough force to kill him, which means that Menthuthuyoupi's A.A.P. is even higher than that. The sole Nen technique he clearly displayed is Hatsu, although the shroud of aura around his body suggests he can also use Ken, and, consequently, Ren and Ten. His explosion ability was manifested unconsciously, as a result of the tremendous rage he had accumulated.
 * Metamorphosis - Menthuthuyoupi's primary ability allows him to freely control any part of his anatomy. In battle, he most commonly uses it to sprout four additional arms and make all six tentacle-like, significantly increasing the range and number of his attacks every second. When he does so, he also produces additional eyes on his head, shoulders and back in order to erase his blind spots and keep track of multiple enemies. He can turn the tip of each tentacle into a blade to inflict more localized damage. He can also give himself wings enlarge his arms to increase the power of his blows, and eject spikes from his torso to impale a nearby enemy. At the cost of expending a few instants to prepare the attack, he can also sprout countless spikes from his back that extend for several meters and can move so quickly that not even Shoot was able to dodge them while riding on top of one of his floating hands. They were also able to pierce it, despite his hands having previously withstood several of Menthuthuyoupi's lashes. He was also able to liquefy his cells in order to feed them to Meruem, and shapeshifted into a much smaller, winged form that allowed him to survive despite donating most of his body mass. He can transform extremely quickly.
 * Rage Blast - Under extreme mental stress during the Extermination Team's raid, Menthuthuyoupi discovered this ability. His body is engorged and swells up as his rage increases until he unleashes it with an incredibly destructive explosion, capable of leaving a crater of a few dozen meters in diameter, before returning to his normal form. The blast results in great pleasure for Menthuthuyoupi, followed by empty despair. Menthuthuyoupi is left especially vulnerable as his body swells up, but through controlling his emotions, he can cancel the process and return to his usual bodily shape in an instant, allowing to strike back after luring in the enemy.
 * Rage Incarnate - As he became capable of controlling his mounting fury, Menthuthuyoupi channeled it into his own body and transformed into a centaur-like creature. This form bears a helm-like extension on his head, a powerful scythe on his right arm, and a large amoebic sac in place of his left arm that contains his rage. He appears to become faster in this state and retains the ability to shapeshift. As his wrath grows, instead of his whole body swelling up, only the amoebic sac on his left shoulder does, removing his previous weakness.

Trivia

 * Menthuthuyoupi's name, like all of the Royal Guards, comes from the Egyptian god Montu and a character named Youpi from a French children's book series called Caroline et ses Amis.
 * His shape-shifting ability may be a perk innate to him as a part of the benefits granted by his Magical Beast genes, which is then highly augmented by his Enhancement Nen (and his incredible amount of aura).