Zero is the deuteragonist of the Mega Man X series. Originally intended to be the protagonist of Mega Man X,[2] he was recast as the mentor and, later, partner of X in favor of an X who looked "more like Mega Man". He is a top class Maverick Hunter who undergoes constant inner turmoil regarding his mysterious past and purpose, of which he seems to see glimpses of in nightmares, and the fact that the Virus does not affect him like it does other reploids, who have their programs corrupted and turn erratic and violent and bent on human destruction, becoming "Maverick". Quite the contrary, it in fact makes him stronger, and causes him absolutely no ill effects, much to his grief and fear. In Mega Man X to X3, his main weapon is the Z-Buster, with the Z-Saber being introduced to his arsenal in X2, but as more of a sub weapon. In Mega Man X4 onwards, Z-Saber becomes his main weapon, and the buster his sub weapon (It actually has not been seen in use since X6). He was actually created by Dr. Wily as his "masterpiece" in order to replace Bass and later destroy X, Light's masterpiece, thus settling his grudge rivalry with Light, and prove his superiority. In Mega Man X6 Zero's ending, he is shown some time in the future, entering a sleep capsule where he will awaken 102 years later on August 15. This would be the first of two times Zero seals himself away.
I was like, OMG.
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lol, yeah. Keji Inafune said he realld did plan on having Zero be Mega Man X, but due to his design being too different from the orginal Mega Man, he was re-cast as Zero. (though that was pretty much said above T_T) Anyways, in the Complete Works, there are some drawings of Zero when he was being created and you can see how he kinda looked like Protoman or Mega Man before becoming who he is now.
Of course, Keji Inafune did eventually get his wish in the Mega Man Zero series. lol. Um, one thing though, the whole seal himself away, is not completly canon, though it was around the time the Zero series was made. (This ending is achieved if you beat the game without finding Zero) So it's kinda a side-story, or at least I don't see it as cannon, myself.
The one I usually see as cannon would be the Telos Tracks from the Elf Wars and on. ^^ Just some info there. lol.