Vent

Vent and Aile are the two main playable characters in Mega Man ZX. Both works for Girouette's Giro Express. Unlike the second game, Mega Man ZX Advent, these characters are almost the same (including backstory, game story, and gameplay), existing to allow the player to pick between playing as a boy or girl. Other than in commercials, it's implied that they both exist in the same timeline as Aeolus' cipher has them both together.

=Vent=

''-"Bigger's not always better. 10 years ago, if they had arrived earlier... Mom would still be alive!" - Vent to Giro.''

''-"I don't wanna hit a girl... but there's a reason I can't let you have it. I will become a Mega Man that can protect everyone!" - Vent to Ashe''

Vent (ヴァン) is one of the main characters. He is the male protagonist that uses the Biometal's power to defend and attack against Maverick attacks. Vent means "Wind" in French. He appears to have between 12-14 years old.

Personality
In Mega Man ZX his attitude's quite kind and determined, but reckless, hot-headed and easily volatile. Due to this he got in trouble more often than not (such as when he attacks Prometheus or his charge in attitude when someone talked about Slither Inc.). And moreover, a desire to protect those around him due to him losing his mother, right in front of his eyes, always saying "I'll protect everyone!" or "Give me the power to protect everything!" He had a deep bond and respect with Giro calling him "boss" ("Senpai" in the Japanese version) and had sort of mentor-student relationship with him. According to Giro, he was a pain, Vent grew up as a lonely child and always was rude to the clients, this conduct being the result of the loss of his mother. When he's angry Vent tends to be reckless such as when he launched himself into battle to save the Guardians, or when he saves Prairie, and merciless to some point (as he tells Purprill that "It wouldn't be a problem to destroy him for his crime" and Serpent when he denies his ideals in the final battle) however tends to meditate his actions and mature with each battle.

History
10 years before Mega Man ZX, Vent went with his mom to the fair, where Mavericks attacked. The Slither Inc. forces repelled them, but Vent's mom was killed. It is said in Vent's story that Purprill was responsible for that Maverick raid. Due to his mother's death he hates Slither Inc. and Serpent, stating that should they have arrived earlier, his mom would still be alive, this is the main reason for his recklessness; his will to protect what he loves.

Mega Man ZX
Vent is the chosen one for Biometal Model X, and through Double Megamerge can use the other Biometals. In the first game Vent fights to retrieve the 6 Biometals, their codes, stop Serpent's Project Haven (which consisted in using the fear of Cyber-elves and people by creating simulated Maverick attacks, and eventually use them as sacrifices to feed Model W; and with Vent's hatred, Model W would awaken completely and become the "ultimate Mega Man") defeat Serpent and destroy Model W. After the defeat of Model W and Serpent at Vent's hand, he calls Serpent a Maverick, as he played with a lot of lives to feed Model W. Serpent, gets mad at Vent and replies that it was Vent who denied change and progress. Vent replies that his concept of progress made a lot of people suffer so he wouldn't let him win. Serpent then declares Vent to be a fool, for the reason he fights is nothing more than a hopeless world and so long as humans had a heart, darkness would always hunt them, they are the true Mavericks. Disturbed, Vent watches the fall of Serpent's company, then is given hope by Giro as a Cyber-elf and learns that he has the power to change the future. And as his last task as a transporter, guide the world to peace. Vent returns to the Guardians, forever thankful for Giro's words and aware the world needs a Mega Man.

Mega Man ZX Advent
In the second second game Vent returns and is 18 years old, now with longer hair, giving him a strong resemblance to Giro, and he wears his shirt open with an emblem added. He appears in Ashe's story, and still uses Model ZX and has been destroying Model W's to end the Game of Destiny. He shows a more calm, calculating attitude, similar to Giro's (Though traces of his temper can still be noticed as he gets angry with Ashe saying "I should finish you off") and his protective attitude is still there. Vent and Aile also appear together when you receive "the Chosen Ones" cipher when you defeat Aeolus. Ashe appears to view him as a role model, as she accepts the truce he calls for and appears to have a small crush on him as she tells him things as "Oh? Who made you the big brother all of a sudden?!" and "Is that something a boy should tell a girl?" and that they would meet again as the world is now their story.

=Aile=

-"Sorry but I can't let you have Model W... Especially if you're a Mega Man!" - Aile to Grey

''-"You're a good kid." - Aile to Grey''

Aile (エール) is the other main character of Mega Man ZX. She can also use the powerful artifacts known as "Biometals" to defend herself and others from Mavericks. Aile means "Wing" in French. She is a tomboy that appears to have between 12-14 years old.

History
10 years before Mega Man ZX, Aile went with her mom to the fair, where Mavericks attacked. The Slither Inc. forces repelled them, but Aile's mom was apparently killed.

Mega Man ZX
Aile is the chosen one for Biometal Model X, and through Double Megamerge can use the other Biometals. In the first game Aile fights to defeat Serpent and destroy Model W. It is unknown if Vent and Aile are related. It's also unknown if the two kids had met at the fair.

Mega Man ZX Advent
In the second game Aile returns in Grey's story. Like Vent, she is 18 years old, wears her shirt open and the addition of an emblem and has her longer hair tied up. She still uses Model ZX and has been destroying Model Ws to end the Game of Destiny. Vent and Aile also appear together when you receive "the Chosen ones" cipher when you defeat Aeolus.

=Trivia=
 * Vent and Aile are the main successors of Mega Man X and Zero, being paired with them as Biomatches.
 * In Mega Man ZX after rescuing the Guardians and citizens from Area G as Aile she can go to the room at the right end of the Guardian Base to change her outfit to an alternate colour.
 * An alternate outfit of Aile makes her resemble Ciel.
 * Vent seems to take some design inspirations from Lan Hikari and Geo Stelar, and bears an uncanny resemblance to Mega Man Volnutt.
 * Aile can crawl faster then Vent.
 * Aile gets knocked back further then Vent when hit by an enemy.
 * Interestingly, based on ciphers from ZXA, it may indicate that both stories are really just the same storyline with the similar details, except the character(s) picked may just be what happened if one instead of the other became the Biomatch (Not to mention in one commercial for ZX they both actually appear and work together). The same would go for Grey and Ashe.
 * Game art for the music of ZX shows Aile holding a modified Biometal X and wearing headphones that bear MegaMan.EXE's logo listening to music. This is an interesting reference to the MegaMan Battle Network series, considering that one of the functions of the PET is a music player, and that a NetNavi is the program that runs the PET, similar to how X is running the music player.
 * Vent is always used for humor in Mega Man ZX. In the commercial, Aile slaps him and makes him drops his boxes, while on the back of the ZXA Tunes he is forced to clean while Ashe listens to music.
 * In the manga, Vent is seen taking out a PET from MegaMan Battle Network 6, and a Servbot toy from his pockets.