Rokkuman X Saibaa Misshon Kanzen Kouryaku Gaido
If you exclude X and Zero as Repliroids, Sigma, whom Dr. Cain created was the first Repliroid. Reploid/Repliroid NEVER meant "Replicate Android" that has always been nothing more than a fan assumption. It has NEVER been stated to have such a meaning in game or in any of it's sources. It's sole meaning is to define a robot with advanced humanlike mental capabilities.
further on reploids-
from the Rockman Zero 4 intro
Repliroids...
Those are the robots
created long ago
to be as much like humans as possible...
Those Repliroids
given personalities
with their advanced technology
worked on humans' behalf
and walked together with humans.
They should have become
the best partners...Reploids are not replicates of X. they are derrivatives. They are based on his design concept, as stated in Day of Sigma. that being, a robot with human like mental faculties.
take this for all it's worth:
Zero: [[to Roll]] What are you doing here? You're just a housekeeping Reploid... You should get home immediately before you malfunction. -- Tatsunoko vs. Capcom: Ultimate All-StarsRoll, a robot of the past generation is considered to be a reploid by Zero. all humanlike Robots have fallen under the term. Including the likes of Roll and her kind. they certainly arent mechaniloids, right?
Even panthoens, "mentally degraded Reploid copuies of X" are considered, again- reploids.
This one thing that makes X superior to his copies is why he is not a reploid.
his "worrying" is his greatest feature. Not compassion. He has the ability to worry on a level far deeper than ordinary reploids. This is due to the suffering circuit installed within him, which constantly makes him worry about matters both Reploid and Human. It makes him unbiased as to those matters. therefore he must constantly balance the worth of both, an impossible situation.
either ignorance or convention. Outside of that, in reality, people also adopted the habit of referring to X and Zero as reploids for the same reasons.
they are referred to as Reploids because they are no different than the definition of the term. a Robot with humanlike mental ability, made to be as human as possible.
As further evidence, Dr. Cain never refers to X in his limited dialogue as a reploid either. The thing that makes X and Zero special is the fact that in reality they are not reploids at all.
What makes them special, is their origins and specialties.
X. Magnum Opus of Dr. Light. Has perfect Virus countermeasures, very powerful Weapon and Variable weapons system, and limitless potential; Abilities that grow as he fights, the ability to worry on a level far greater than any robot or reploid. the base the reploid race was based on.
Zero. Magnum opus of Dr. Wily, in his last ditch effort to prove his superiority. has imperfect virus countermeasures, but is unnafected by viruses. is a carrier and source of the Sigma Virus. has incredible combat skill and determination, the perfect soldier, does his mission because it is his job, despite personal feelings. has the Saber tactics system. Also grows as he fights. The catalyst for the creation of Cyber elves.
Axl is special as well. because he is special. Copy ability, immune to all viruses through his copy chip, unknown origins and mysterious scar. has intense hatred for mavericks that he cannot explain. prototype of the new generation.
(and Justice from Wily) worked on extensively (though with Wily it may have been accidental).
Zero's change from berserk maverick to hunter was a matter of circumstance.
When Wily created Zero, he contained a flaw in his cognitive program that made him overly violent and unwilling to obey orders, so Wily sealed him away.
During his battle with Sigma, they were both infected by the virus emanating from Zero's capsule. Zero's armor was breached somewhere along the line, allowing the virus easy access to him. it is what caused his malfunction right as he was about to kill Sigma. Sigma punched his head, knocking him out. something there happened, and his personality was changed. he became calm and level headed.
It is theorized that the virus was created to pacify Zero. dampening his emotions in addition to boosting his power. this can be observed with the original Sigma/Zero fight, where Zero after being infected became normal. and upon being infected again with the Zero virus in X5's alternate scenario, became a cold hearted killing machine, no longer caring about the hunters or the maverick, devoted only to his mission of killing X.