

Did you know that Colonel and Iris were designed to be one perfect Reploid by scientists working for Repliforce? And that said Reploid was supposed to be based on X? The irreconcilable personalities meant the project needed to be split to allow any sort of functionality, with Colonel gaining X's fighting spirit and sense of justice, whereas Iris retained X's compassion and pacifism.

It's possible to defeat all eight of the main bosses in the game without taking damage, because getting hit with their weakness tends to reset their attack pattern, and then you just hit them again the instant their invincibility frames are over. Breaker: When playing as X, all of the special weapons when used against the bosses weak to them.

One day, the aerial city Sky Lagoon is sabotaged by Mavericks, causing it to crash to the ground with Repliforce suspiciously in the area, the Maverick Hunters request Colonel disarm his men and come in for questioning. This controversy creates tension between Zero and his sweetheart Iris, who is the sister of Colonel, an influential leader in Repliforce. However, they consistently fail to protect humans, causing humanity to distrust them and their military might. In the year 21XX, years following the Doppler rebellion, a global Reploid military called "Repliforce" is formed to help combat the constant Maverick uprisings. Mega Man X4 is the fourth entry in the Mega Man X series, released on the Sega Saturn and PlayStation on August 1997 in Japan, September 1997 in North America, and October 1997 in Europe.
