Iris

"Let's live together, in a world where only Reploids exist..."

- Iris on her deathbed, her idealistic world to live in

Iris (アイリス) was Zero's Navigator in Mega Man X4 and X's in Mega Man Xtreme 2. She was also the younger twin sister of Colonel. Like her brother, she speaks with a British accent in the English language versions of Mega Man X4.

Appearance
Iris appears as a young-looking female brunette Reploid with green eyes and very long hair, comparable to Zero's length. Her armor consists of a blue and red scheme with yellow accents and is modeled into the form of a dress, her limbs being white, her boots white, and her hands appearing to have segmented knuckles. In X4, her boots gain a black outline and have a defined lavender color with the addition of a red beret on her head. In Mega Man Xtreme 2, she has a small section on her upper chest with the insignia of the Repliforce army.

After taking Colonel's core into her body in Mega Man X4, she appears as a Ride Armor-like being with a purple color scheme and a pair of wings. It is unconfirmed as to whether she entered a ride-armor vehicle or became a similar being herself.

History
She was developed by Repliforce scientists as half of the perfect fighting Reploid. Colonel, her brother, was the other half. Her half was of the peaceful arbitrator, and Colonel's was of the strong-willed fighter. Repliforce scientists had struggled to make these two factors into one Reploid, but the differences were irreconcilable, so they split them into brother and sister Reploids.

Mega Man Xtreme 2
The Erasure incident was Iris' first mission as a Navigator for the Maverick Hunters. She took the roles of both Navigator and item development by making power-ups out of the Maverick's DNA Souls. In the Xtreme Mode ending, Zero feels bad that her first mission was a tough one and the Colonel will blame him.

Mega Man X4
When the Repliforce was labeled Maverick after the Sky Lagoon incident, both X and Zero were assigned different missions to gather information about Repliforce's coup and to cut off their support lines. Iris assisted Zero on his missions as being his operator, like during the Erasure incident. However, Iris herself was part of Repliforce while her brother, Colonel, was Repliforce's second-in-command and therefore an imminent target for the Maverick Hunters. When the two of them battled in the Ceremony Hall of Repliforce's command center, it was Iris who stopped the two Reploids from terminating each other by begging her own brother to stop, since Zero had previously saved her life after the Sky Lagoon had crashed. Colonel, who had always regarded Zero as a friendly rival, backed off. Zero, on the other hand, stated that someone had to stop Repliforce at all costs, much to the grief of Iris.

When Repliforce's coup began, Zero rushed to the space port to stop the ascension of the military troops to the newly constructed space station of Repliforce, Final Weapon. There, he battled Colonel again, this time killing him. After that, Zero traveled to Final Weapon where he was encountered by Iris, who was blinded by the grief of losing of her brother and anger for Zero killing him. She had salvaged Colonel's Control Chip from his remains, fusing it with her own programming, thus resulting her body to transform into a massive winged Ride Armor-like combat form which Zero was forced to battle. Even though Zero didn't mean to, he damaged the exterior power core of the structure, resulting in the destruction of the armor. He hurried to Iris' body. However, it was too late to save her, and while she lay dying in his arms, she whispers to him that she did all this because she wanted them to live in a Reploid only world. Zero, totally overwhelmed by her death, began questioning his own reasons for fighting.

Sigma would later antagonize Zero further, by revealing his involvement in the whole ordeal. He even taunts him by saying, "Iris is waiting for you!" before their battle.

After Final Weapon is destroyed, Zero flies back to Earth in an escape shuttle, but he is tortured by the thought of being unable to save anyone.

Mega Man X5
Iris reappears as a memory in Zero's ending, where an image of her is seen by Zero as he lay dying and all he can do is quietly apologize to her.

Rockman Online
In the now-cancelled Korean MORPG, Iris appears working as a Navigator (along with Alia) for the UCA (United Continent Association) in the games first teaser trailer. As this games story is said to take place in the far future where the characters from both the Mega Man and Mega Man X series have long since passed away, this Iris (much like the other series robots and Reploids appearing in the game) is a copy/recreation, embedded with the DNA Soul of the original.

Project X Zone
Iris appears in the crossover RPG as an event character. She makes her only direct appearance in Chapter 29 (負けない、愛 Makenai Ai) of the game.

With X and Zero shocked to see Iris alive and well, X recognizes her as the younger sister of Colonel, and "the girl from that Repliforce incident", which suggests that the events of this chapter take place after Mega Man X4.

She still wishes to live in a world only composed of Reploids together with Zero, but he reminds Iris that such a world is nothing more than an illusion. He is then asked by her if a Reploid only world is meant to be his purpose and desire, part of the reason why Iris is present. Afterwards, Zero suffers an emotional breakdown, pondering about whether or not a Reploid only world was really the reason he was fighting for, with Vile taunting him for getting emotional over a girl's wish, claiming that the latter was exactly the same as the former before.

Confused about Iris at first, the other characters present then realize that Zero is in trouble, and that they and X must protect him from danger, while attempting to defeat Vile at the same time. The game splits the winning conditions down to two options: reach Zero within the next nine turns or defeat Vile, otherwise a game over will be declared. Until then, X's unit is paralyzed and unable to fight.

After the defeat of Vile at the hands of the other fellow protagonists, Zero eventually recovers from his emotional breakdown and recalls his duty as a Hunter, and tells Iris that a Reploid only world is impossible. Aura from .hack appears and encourages Zero to move on and not give up; she also mentions that Iris and her feelings are not supposed to be present, hence causing her to fade away, after bidding farewell to Zero.

Iris is mentioned again by X in Chapter 37, where the latter comments about Vile using her back in The World, as well as how he hurt Zero emotionally.

Quotes

 * "You are now on Laguz Island where the Erasure Incidents have happened. What's the situation there?"
 * "Okay. But please don't get too wild and bite off more than you can chew."
 * "X! Zero! We've just received..."
 * "Gareth... I can't find any data on such a Reploid in our database. Plus, we have found unfamiliar items..."
 * "They seem to have been resurrecting enemies by somehow utilizing DNA."
 * "It seems so. A Reploid's DNA is like that of a human's soul. From now on, let's call it a DNA Soul. We may be able to create something useful from Mavericks' DNA Souls."
 * "Wait a second. I believe the laboratory is a very dangerous place."
 * "Yes. I'm not going to stop you. Just please take this device. With this device, you can execute a Player Change at any time by pressing SELECT."
 * "Zero! Stop a minute and think about this! If you separate, you are walking into their trap. Why don't you fight together!?"
 * "Good job! You've cleared the game! If you save the data here, you can utilize the saved data for another mission. Please be sure to save and then try a new mission!"
 * "Great job! You have cleared two missions. You deserve a Special A level Hunter! But still I feel uneasy... I wonder if we really did restore peace. "
 * "X! Zero! The hollow Reploids are coming to life one by one!"
 * "Supreme job! Now that Sigma has been defeated, true peace has been restored. So now I have a present for you! This is an awesome mode where you fight against 8 bosses. How fast can you defeat them? Good luck!"
 * "Zero... Did you come to save me?"
 * "A huge Maverick appeared and..."
 * "My brother Colonel started the coup!"
 * "Please don't fight against him! This must be some kind of mistake!"
 * "Zero..."
 * "I've got a message from Repliforce..."
 * "Don't go Zero! Don't fight him!"
 * "Please stop, brother! ...Zero!"
 * "Stop! Please! Brother, please! Don't you remember?! Zero saved my life!"
 * "Zero, please don't fight with my brother! If you do I'm afraid that one of you might end up..."
 * "Zero!"
 * "Repliforce is at the space harbor..."
 * "No! ...Please wait Zero! I don't want to see you two fight..."
 * "So you fought with my brother..."
 * "Then it's over. Everything..."
 * "Good bye Zero..."
 * "Okay, I'll do it."
 * "Forgive me, Zero!"
 * "Stay with me, brother..."
 * "Please... stay away from Repliforce. Let's live together in a world where only Reploids exist..."
 * "Yes, I know... but I wanted to believe it... I wanted to live in a world where only Reploids exist. With you..."

Trivia

 * Iris' presence as a trainee Navigator in Mega Man Xtreme 2 was due to the development team feeling sorry for her in the events of Mega Man X4, as detailed in Mega Man X Official Complete Works. The game also hints towards her feelings for Zero, and vice-versa, with the two having dialogue specific to Zero's game alone.