Perhaps the most often misunderstood matter concerning Final Fantasy VII's plot is the matter of Cloud being a Sephiroth Clone. Aside from the fact that many have misinterpreted this to mean that he was a genetic duplicate of Sephiroth, there's the fact that he is so much more often misperceived to have been a failed experiment. This is simply not the case.
Where the confusion regarding this matter arises is from Cloud and Hojo's discourse in the Northern Crater before Meteor is summoned:
Hojo
"Ha, ha, ha... this is perfect!!!"
"It means that my experiment was a complete success!"
Hojo
"What number were you? Huh? Where is your tattoo?"
Cloud
"Professor Hojo... I don't have a number."
"You didn't give me one because I was a failed experiment."
Hojo
"What the--? You mean only a failure made it here?"
Cloud
"Professor... please give me a number. Please, Professor..."
Hojo
"Shut up, miserable failure..."
This is often cited as the evidence of Hojo considering Cloud to be a failure. What should be noted about this is that it was
Cloud who told
Hojo that Cloud was a failure, and, bearing his "proof" in that he didn't have a numbered tattoo, Hojo believed him. Cloud believed that he was failure based on his lack of a tattoo, and what Sephiroth had told him moments earlier:
Sephiroth
"Ha, ha, ha......"
"I want to take you back to your real self."
"The one who gave me the Black Materia that day..."
"Who would have ever thought a failed experiment would prove so useful?"
"Hojo would die if he knew."
Cloud
"Hojo!? What does he have to do with me!?"
Sephiroth
"Five years ago you were..."
"...constructed by Hojo, piece by piece, right after Nibelheim was burnt."
"A puppet made up of vibrant Jenova cells, her knowledge, and the power of Mako."
"An incomplete Sephiroth-clone. Not even given a number. ...That is your reality."
Deceived by this false information, Cloud believed that he not only wasn't a normal human being, being instead constructed from JENOVA Cells infused with Mako, but that he was a failed experiment at that. This influenced what he told Hojo, and subsequently, Hojo's feelings toward Cloud. What Cloud failed to recall at this time was that Zack broke himself and Cloud out of the Shinra Mansion before Cloud could be given a tattoo, for Cloud was not the failure at all. Zack was.
In defining who is and is not a failure in the experiment that Hojo was carrying out, one must first understand what it was that Hojo was attempting to test with the Sephiroth Clones, and how he was going about doing so. His Nibelheim experiment was conducted for the sake of testing his JENOVA Reunion Theory, it stating that even if JENOVA's Cells are seperated, those seperated pieces will eventually reunite:
(Hojo, at the Reunion)
Hojo
"You see, even if Jenova's body is dismembered, it will eventually become one again. That's what is meant by Jenova's Reunion.
In order to conduct this experiment, Hojo had the survivors of Sephiroth's massacre in Nibelheim rounded up for experimentation:
(From Zangan's letter to Tifa, as viewable on Disc 3 of the game)
"Tifa, what's happened to our town? Was it all an illusion, or just a dream? No, it was neither. I remember trying to get people out of the flames, but not having the strength... Burning with anger, I went to the reactor to kill Sephiroth."
"But he was nowhere to be found. Instead, I found you, collapsed inside. I felt saving you was far more important than going after Sephiroth. There were several others that were still alive inside, but I was only able to save you."
"As I was coming out of the reactor, Shinra troops were just arriving. I recall a scientist named Hojo was in charge. He ordered the troops to gather up everyone still alive for the experiment. I didn't know what type of experiment he was talking about, but I wasn't about to let them have my dearest student."
These survivors included Cloud and Zack. Once captured, the two former members of Shin-Ra and the other survivors of Nibelheim -- minus Tifa and Zangan, of course, the former having been taken to safety by the latter -- were infused with Mako and injected with JENOVA's Cells. A body and mind that displayed no response to JENOVA's Cells would obviously be ill suited for testing the validity of the Reunion Theory, as their own will may override JENOVA's attempt to call that individual to itself. With this in mind, only the weak-willed would be suitable for the experiment, and, thus, successful. It was Cloud that had a reaction JENOVA's Cells, whereas Zack did not:
(From the Escapee Reports in the back of the Shinra Mansion's library; note that Zack is Specimen A (the former member of SOLDIER), while Cloud is Specimen B (the regular))
Escapee Report No. 2
Description of the time of capture.
A - Former member of SOLDIER/Number ( )
No effect could be detected from either Mako Radiation Therapy or Jenova on him.
B - Regular/Number ( )
Reaction to Jenova detected.
Note also that in the parentheses where the two would have had numbers, there are blank spaces. They had not yet received their numbers.
What's made obvious from this -- as well as the deteriorating state of Cloud's mind after his and Zack's escape, whereas Zack seemed relatively unphased -- is that Cloud was a successful Clone, but -- at worst -- could be described as "incomplete" rather than a failure.
One final point of note to consider is that, in the moments preceding his death, Hojo himself declares Cloud to be the only Sephiroth Clone that was successful, most likely because Cloud was the only one he saw at the Reunion, those in the black cloaks having been killed moments before and their bodies cast down into the Northern Crater, most likely to be assimilated by JENOVA:
Hojo
"Every time I see you, I..."
"It pains me that I had so little scientific sense..."
Hojo
"I evaluated you as a failed project."
"But, you are the only one that succeeded as a Sephiroth-clone."
"Heh, heh, heh......... I'm even beginning to hate myself."
An interesting note to make at this point is that while in regard to Hojo's experiment "success" was measured in terms of whether or not the subject had a reaction to JENOVA, Cloud could be described as the only successful Clone in terms of actually attaining Sephiroth's abilities, as he retains his mind after the experimentation, while still reaping the benefits of the augmentation offered by the JENOVA Cell injections and Mako infusion.
The answer to the seemingly eternal question of Cloud's failure or success as a Sephiroth Clone is that he, indeed, was a success.
~ Squall of SeeD