Iris.EXE

Iris.EXE is a NetNavi and the younger sister of Colonel.EXE. She appears in MegaMan Battle Network 6 and is presumed to be human. She however had always been traveling through the real world in a CopyBot. Lan discovers her true form during the final events of the game. While she had a crush on Lan Hikari, and almost worked up the courage to tell him, she decided against it as it would never work out between them. She was deleted after fusing with Colonel.EXE in order to delete Falzar/Gregar once and for all. Her role in the anime is much different, in that she is trying to save her world from destruction.

Games
In the games, Colonel.EXE was made to be the perfect military NetNavi, and Iris.EXE was made when Wily extracted the part of Colonel's data that allowed him to control machines and apparently the data that worked as his kindness program. She led Lan throughout the course of the game towards his goals and provided him CopyBots whenever necessary.

She was later kidnapped by Dr. Wily and used to control the Cybeasts Falzar and Gregar, but in a turn of events she remerged with Colonel.EXE and used their combined strength to beat one of the Cybeasts while MegaMan.EXE defeated the other. Unfortunately, Dr. Wily had programmed Colonel and Iris to be deleted when they remerged, and the result was just that. However, in the end of the game where Wily redeem his actions, it is mentioned that both her and Colonel are rebuilt in the future by Wily.

Anime
In the anime Rockman.EXE Beast she is the younger sister of the Beyondard Colonel.EXE, and first comes to earth to locate the Synchronizer: Trill.EXE. She is Colonel's emotion data given form, and at the end of the anime partly merges with him, enough to return Colonel's emotions data but still remain as a NetNavi. She always loved her older brother and was sad when Colonel was gone. She also has a NetNavi, but it is just an extension of her that allows her to operate in both worlds with ease. She is seen by Trill as an older sister, being refered to as onee-chan. She also appears in the Beast+ series.

Manga
Iris appears in the final two volumes of the manga. She is the keeper of the legendary program that would be bestowed upon the strongest NetNavi in the world. In order to determine who was worthy, she brought many NetNavis, including MegaMan, to the Underground to fight each other and had them collect the emblems from the losers.

Iris later appears after Colonel gives MegaMan his emblem and reveals that she herself is the legendary program and is Colonel’s sister. At first she and Colonel were one program that was created to defeat the Cybeasts, but they were unable to do so and instead sealed the cybeasts in the underground. Iris remained in the underground to keep them imprisoned while Colonel left to search for the ultimate NetNavi.

Iris then bestows MegaMan with the power to Super Beast Out and is deleted along with Colonel. She makes one final appearance to tell MegaMan that the cybeasts were always destined to return and that destroying the cybeast’s nucleus would destroy the creature for good.

Trivia

 * As mentioned above this was only shown instance of a navi falling in love with a human. This was revealed right before Iris merged with Colonel in the game, as she said, "Lan Hikari... I..." As Colonel replied, "What is it you want to say?" as she replied, "Nevermind... I'm just a NetNavi after all." Presumably this has happened before, however, as a script at the Beach studio In BN3 outlines a soap opera in which a woman is in love with her friend, who is in turn in love with his friend's navi.
 * Iris.EXE is the one of the three navis in the BN series to have a counterpart from Mega Man X series, along with Colonel.EXE and Zero.EXE.
 * The fact that Iris.EXE is deleted at the end of Battle Network 6 may be a reference to the fact that her original counterpart died at the end of Mega Man X4.