Serpent

Serpent (セルパン) is the antagonist of Mega Man ZX. He is the Model W Mega Man and the president of Slither Inc. a company which specializes in the excavation of ancient technology such as Biometals.

Appearance
Serpent is a large, muscular male Reploid. He has fair skin, violet eyes and hair, with a long spiked forelock. His face is distinguishable by the wide squared chin and slightly pronounced cheekbones. His outfit resembles an armored business suit, made of a long green jacket decorated with golden trim, blue gems and metallic shoulder plates, complemented by a violet cravat. His legs are covered in thick black armor, with golden plates around the ankles and white for the feet.

Although Serpent is considered a hero by the people, he is in fact a corrupt man that achieves his goals by any means necessary. He believes in survival of the fittest and that evolution and progress require sacrifice, which is rooted in his past as raid survivor and member of the Guardians, as well as the influence of Biometal Model W. Aile accuses Serpent of acting out of fear of his past and what he had become, while Prometheus claims that Serpent's will is too weak to handle Model W and his soul will be slowly consumed with time.

Background
At some point in the past, Serpent survived a Maverick raid and joined the Guardians. He was a member of the recon unit led by the first commander that discovered and researched Biometal Model W. However, Serpent became obssessed with the Model W and this eventually drove him to madness, causing him to annihilate the entire unit to claim Model W (although the commander managed to escape and seal the Model W core in Area M).

After taking measures to prevent any information about his past from leaking, Serpent used ancient technology to found Slither Inc. and solve an energy crisis, gaining reputation as a national hero. He was eventually approached by Prometheus and Pandora, who told him about the Game of Destiny and the true power of Model W. Serpent then planned out Project Haven, which consists of staging Maverick raids throughout the years to gather the Cyber-elves of the terrified victims to feed Model W. While also searching for the Model W core, he comes into possession of Model H, Model F, Model L and Model P, employing them in the creation of Pseudoroids to further his plans.

Mega Man ZX
Serpent first appears during a Maverick attack on Area D, having subdued Girouette near the Slither Inc.'s head office. He uses his influence to turn Girouette against the Mega Man Model X (Vent / Aile), making them fight eachother. As Giro attempts to resist Serpent's control, Serpent eventually strikes down the two Mega Men, calling them "disappointments" as he orders Pandora to steal the passwords to Model W's seal. He then leaves the two Chosen Ones for dead, deciding to continue his act as a public hero while the Mavericks and Pseudoroids do the dirty work.

However, the Model X Chosen One survives the incident and combines the power of Giro's Biometal with Model X to become the Mega Man Model ZX, using this power to defeat Serpent's Pseudoroids one by one. Serpent then sends Prometheus and Pandora along with a Slither Inc. fleet to destroy the Guardians, but the attempt is again thwarted by the Mega Man ZX.

Serpent later appears in Area M, briefly confronting the Mega Man ZX before escaping with the Model W core while Pandora fights the Chosen One. He then starts a final Maverick assault on Area O to collect more Cyber-elves, which is again stopped by the Mega Man Model ZX, who takes the fight to Serpent himself in Slither Inc.'s head office. During the confrontation, Serpent feeds the Model W core with the harvested Cyber-elves and uses Model W to Megamerge. As the two Mega Men battle, Serpent reveals the final key to his plan; to harnesses the hatred of the Mega Man ZX for him and use it as the final sacrifice to Model W, fusing with it to become a powerful robot. However, Model W's resurrection is short-lived, as he is defeated again. He then tells Vent that he is a maverick in response to the latter's statement that Serpent is a maverick, and also implies to Aile about her blood transfusion from Master Albert that allowed her to become a Mega Man. As Serpent dies, he declares all of humanity to be Mavericks for stopping progress.

Mega Man ZX Advent
Serpent is briefly seen along with Vent, Aile, Girouette, Aeolus, Atlas, Thetis and Siarnaq in an image from one of Biometal Model A's ciphers (code UC80 to AC195), which reveals to the Model A Chosen One (Grey / Ashe) that every Mega Man received the DNA of Master Albert.

Mega Man ZX (Manga)
Serpent reprises his role as the villain in the manga by Shin Ogino. After Vent combines Model Z with Model X to perform the Double Megamerge, Serpent decides to deal with him before he becomes too "troublesome". He is enraged when Hivolt and Lurerre are both defeated by Vent, and orders Prometheus and Pandora to destroy the Guardians backing him up. Although the attempt fails, the Guardian Base is disabled and Serpent starts Project Haven, sending a Maverick army to attack the city while the frightened people are captured to feed Model W with their negative emotions.

After Prometheus tricks Vent into using his rage to restore Model W, Serpent uses the Biometal to Megamerge and fight Vent. However, just as he is about to deal the final blow, Sho brings Model H, Model F and Model L, which were damaged in Vent's earlier battle against Purprill. Serpent blasts Sho away, enraging Vent who in turn uses all the Biometals to gain the upper hand. But the situation changes when Vent's rage fuels Model W further, transforming Serpent into a giant robot. Claiming to have the power of a god, Serpent nearly defeats Vent, but he falls when the positive emotions of the people are channeled into Vent, giving the Mega Man Model ZX the power to defeat Serpent.

Biometal Form
Serpent uses a fragment of Biometal Model W to Megamerge and fight the player. This form has orange horns emerged from the shoulders, feet and head, the whole body is covered with a black/white armor with yellow lines run across. His arsenal include mostly increased physical attacks (uppercut, kicks), shooting from fingers, large energy balls, and an Overdrive that increases the velocity of his attacks, with a large variety of moves:
 * Gauntlet Swarm: Serpent fires five energy bullets from his fingertips simultaneously. He can do it in the ground and in the air.
 * Slide Kick: Serpent slides across the floor with his foot forward.
 * Sky Uppercut: Serpent kicks upwards, jumping high enough to reach the top of the screen.
 * Earth Crusher: Serpent phases to the top of the screen and drops on the player with his foot charged with energy; impact causes energy sparks to fly across the field.
 * Phase Sphere: Serpent charges a concentrated energy sphere with his fingertips and fire it towards the player. If the sphere takes enough hits, its polarity reverses and damages Serpent instead.
 * Overdrive Invoke System: Create an resonate aura that increase the velocity and accuracy of his attacks.



Ultimate Form
Serpent fuses his body with the Model W core for the final battle. Once he lost a health bar, his body continues to transform throughout the fight, changing his weak point and giving him new attacks. This form has total of three phases to begin with.
 * Chaos Meteor: His orange horns fire beams at the top of the screen; four blazing rocks fall across the field. The meteors then produce eight fireballs which slowly home on the player.
 * Crystal Break: Hands produce clusters of purple crystals on both corners, which he shatters in an attempt to hit the player with the shards.
 * Atomic Pulses: Serpent spits green energy balls at the player, which split into two diagonal beams on contact with the floor. Those can be struck, causing them to split into four diagonal beams.

Console Phase
As Serpent's body expands, he gains a new set of eye-like projectors from both shoulders, the upper body is brought higher, leaving a purple void at the midst of the body. This phase has more both arms vulnerable to attacks. Two firsts attacks below is also used in the third phase.
 * Dark Vortex: Charge a purple vortex from the void which draws the player towards his midsection.
 * Dark Debris: After the previous attack, Serpent fires a series of small purple beams which slow down the player on contact.
 * Tractor Shots: Sending small aiming orbs that once locked, targeting beams at the player.

Redeemer Phase
Serpent releases a second set of hands in the later stages of the fight, which he uses for a new set of attacks, and levitate the original upper body part, forming an absurd giant face figure, leaving a big weak point for attacking.
 * Light Barrage: Serpent's fingertips and green helmet horn fire a series of green energy circles aimed at the center of the field.
 * Crystal Crash: producing a crystal cluster in the center of the screen, smashing it and pounding the ground as the shards fly everywhere.

Trivia

 * It should be noted that Serpent was not necessarily evil, as it is suggested that Model W drove him insane. He believes he is doing the right thing, because in the final battle he states he wishes to evolve the world rather than destroy it, and in Vent's story, he states that he wishes to remove all the pain and suffering. In the end, it was his own doing that undid Slither Inc..


 * Serpent is a word of Latin origin that is commonly used in a specifically mythic or religious context, signifying a snake that is to be regarded not as a mundane natural phenomenon nor as an object of scientific zoology, but as the bearer of some symbolic value. Serpents are also connected with renewal or regeneration, so it can be said he was named this because he wishes to destroy and evolve the world.


 * Serpent shares many similarities to Sigma: both were originally members of a protection force, both were corrupted by a villainous source, both have ideals of evolution and both are the antagonists of the games they appear in. Serpent also physically resembles Sigma, although he is distinguished by a peculiar hairstyle.


 * It can be assumed that Pandora and Prometheus were controlling Serpent the whole time because he seems calm, but when Pandora and Prometheus were not with him (or in close proximity, as shown in his taking Model W), his composure was lost and didn't know what he was doing. This is also implied by some Slither Inc. employees when they said that Slither Inc's way of operation changed as soon as Prometheus and Pandora began to work there.