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 a main character of Mega Man ZX, and the female counterpart of Vent. She can also use the powerful artifacts known as Biometals to defend herself and others from Mavericks. She is a tomboy and energetic girl that's 14 in Mega Man ZX and is 19 years old in Mega Man ZX Advent.

Personality
In Mega Man ZX, she seems to be more lenient towards others, excluding her foes and is a bit more compassionate than Vent. That in fact, is more direct and prefers more to battle that strike a conversation. In Mega Man ZX Advent, however, her personality shifted a bit. As she got older, Aile seems to have become more professional with whomever she meets, as shown when Grey was blunt and disrespectful towards her when introducing himself. She also seems a bit more cocky and apparently careful when she finds someone that appears to be an enemy (she confused Grey as an enemy because he's a Mega Man and she suspected that he wanted to ressurect Model W),but she's still caring and even acts as a older sister to Grey.

History
10 years before Mega Man ZX, Aile went with her mother to the fair, where Mavericks led by Purprill attacked. The Slither Inc. forces repelled them, but Aile's mother was apparently killed. Unbeknowest to her, it actually was part of Project Haven and the Slither Inc. forces staged the attack to make themselves look like heroes.

Mega Man ZX
Aile is the Chosen One for Biometal Model X, and through Double Megamerge can use the other Biometals. In this game, Aile fights to defeat Serpent and destroy Model W, to put a stop to Serpent's Project Haven, which consisted of using the fear of Cyber-elves and people by creating simulated Maverick attacks, and eventually using them as sacrifices along with Aile's hatred to feed Model W and awaken it as the "Ultimate Mega Man". After defeating Model W and Serpent, Serpent divulges that all Mega Men were designed to destroy each other and survive to control Model W, and that the process was all just a game to decide the ruler of the world. Serpent then continues on to say that even she has the blood of "the man who made Model W" in her veins, which disturbs Aile. As Slither, Inc. begins to collapse, Serpent claims that destruction still awaits them so long as humans have emotions, there will always be hate, they are the true Mavericks. Aile, still troubled by Serpent's words, is reassured by Giro appearing as a Cyber-elf telling her to forget the past, that destiny is not something that is given and that her power is the key to shaping her own future. With restored confidence, Aile swears to use her power responsibly to fight for what matters.

Mega Man ZX Advent
In the second game, Aile returns in Grey's story. She is 18 years old, wears her jacket open with 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 in an image when the player receives the "Chosen Ones" cipher when Aeolus is defeated, revealing that Master Albert, using his government position, made sure that select individuals who reported to Legion were infused with his DNA.

Aile appears in person while inside the Quarry, where she ends up fighting the Mega Man Model A Chosen One, Grey due to a misunderstanding of intentions with Model W (both think the other was trying to retrieve it instead of both wanting to destroy it). As a consequence of the fight and her remaining afterwards, Aile also ends up exposed to the fifth cipher being unlocked inside Model A alongside Grey.

Later, she assists Grey in destroying Ouroboros and defeat Albert. Everything was turning in their favor, until all Mega Man came to stop Grey and Aile takes his place in fighting them. In a disvantage of four against one, Model Z offers to sacrifice himself using some kind of self-destruct  function making Biometals except Model X go berserk and tells Aile to take care of Grey as he fainted from his fight against Albert, who was defeated.

In the Ending scene, she tells Grey what happened after and when Grey departs on an Adventure with Model A, she bid farewell as she tells that she hope they meet again.

Rockman ZX Anime Promo Trailer
In the animated Rockman ZX trailer promo, Vent and Aile are shown to co-exist and work at Giro Express together and act like siblings to each other. During a Maverick attack on the city, Giro utilizes Model Z and attempts to fight them off, however he is mortally wounded. Vent and Aile gain the power of Model X and find a dying Giro who gives them Model Z, and together they become Mega Man ZX. They take down Protectos the Goreroid and several Pantheons before stumbling onto a secret facility. Vent and Aile are then shown utilizing the other Models while fighting together.

Rockman X DiVE
Aile as she appears in Mega Man ZX will appear as the first playable character from the Mega Man ZX series in Rockman X DiVE, where she will be able to fight in her civilian form and as Model ZX. She qualifies as an A-rank character.

Etymology

 * Aile means "Wing" in French.
 * Aile is also Turkish for "family".

Trivia

 * Her appearance in outfit, hair and eye color (except for hairstyle) are identical to Vent, almost making them look like twins. But there is no proof whatsoever of what their relation actually is.
 * Interestingly, based on Model A's ciphers from Mega Man ZX Advent, it may indicate that both stories are really just the same storyline with 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, both Vent and Aile actually appear and work together).
 * After rescuing the Guardians and citizens from Area G in Mega Man ZX as Aile, the player may go to Chêne's room at the right end of the Guardian Base to change her outfit to an alternate color. The player can also do this by talking with Luca in the city from the start in easy mode, or after a quest in normal and hard modes.
 * Aile can crawl faster than Vent, but also gets knocked back further than him when hit by an enemy.
 * Cover art for the ZX soundtrack shows Aile wearing headphones and listening to music, using Biometal Model X as the CD player.
 * Excluding spin-offs, Aile is the first playable female protagonist in the entire Mega Man franchise.
 * She is not, however, the first female playable character in the series. That role belongs to Roll and Kalinka in RockBoard.
 * Also, the first female playable characters in a main series sidescroller title are Alia, Layer and Pallette, from Mega Man X8. However, being secret unlockable characters, they do not qualify as protagonists.
 * In the original Mega Man ZX both Aile and Vent are voiced by the same voice actress: Sanae Kobayashi.
 * Aile, despite being female, is never referred to as "Mega Woman." The reason for this is that the ones who possess Biometals are simply dubbed "Mega Man" regardless of gender.
 * Aile has eight color swaps when she talks to Luca. Though she will be in default during dialogue and status mugshots. These include:
 * Yellow shoes and jacket with dark red hair and green eyes.
 * Teal shoes and jacket with pink hair and green eyes.
 * Pink shoes and jacket with blonde hair and blue eyes.
 * Silver shoes and jacket with chestnut hair and red eyes.
 * Bright pink shoes, jacket and pants with brown hair and green eyes.
 * Purple shoes and jacket with red hair and green eyes.
 * Green shoes and jacket with orange hair and red eyes.
 * Dark gray shoes and jacket with orange hair and green eyes
 * Unlike Vent, it is never made explicit whether Purprill the Mandroid was the Maverick responsible for her parents death, although she implies it was indeed the case when she yells at Purprill "I'm the one with the memories here. You get out of my park!"