From MMKB

These are the two main 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.

It may be possible that Vent & Aile could be brother and sister, for obvious reasons.

[edit] Vent

Vent
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Appearances in games:	Mega Man ZX Mega Man ZX Advent
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Vent (ヴァン, Van^?) 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.

10 years before ZX, Vent went with his mom to the fair, where Mavericks attacked. The Slither inc forces repeled them, but Vent's mom was apparently killed. It is said in Vent's story that Purprill was responsible for that merciless crime. 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 defeat Serpent and destroy Model W. In the second game Vent returns as an adult or older teen in Ashe's story, now with longer hair, giving him a strong resemblance to Giro and wears his shirt open with an emblem added. He still uses Model ZX and has been destroying Model Ws to end the Game of Destiny. He appears to have a much calmer attitude, further alluding to his resemblance to Giro. Vent and Aile also appear together when you recieve "the Chosen ones" Cipher when you defeat Aeolus.

[edit] Aile

Aile
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Appearances in games:	Mega Man ZX Mega Man ZX Advent
Graphic:

Aile (エール, Ēru^?) 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.

10 years before ZX, Aile went with her mom to the fair, where Mavericks attacked. The Slither inc forces repeled them, but Aile's mom was apparently killed. 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 brother and sister, or had the same parents at the time. It's also unknown if the 2 kids had met at the fair. She is a tomboy.

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

[edit] Trivia

• Vent and Aile are the main sucessors of Mega Man X and Zero, being paired with them as Biomatches.
• An alternate outfit of Aile makes her strikingly resemble Ciel.
• Vent seems to take some design inspirations from Lan Hikari and Geo Stelar, and bears an uncanny resemblance to Rock Volnutt.
• 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 Mega Man Battle Network, 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.

Mega Man ZX series
Main characters
Vent • Aile • Ashe • Grey • Girouette • Prairie • Guardians • Sage Trinity • Hunters • Raiders Master Albert • Serpent • Prometheus • Pandora • Pseudoroids
Games
Mega Man ZX • Mega Man ZX Advent