I think I'll go with Cloud as a Compilation character, even thought the OG personna is not THAT much different, IMO.
As a kid and as a teen, he was the awkward, shy and introverted one, got violent easily to prove his strength, kinda stupid, but what kid isn't. He takes things waaaaaay too seriously and thus, his failures depress him easily, too.
In CC, he was the kid, the young one, the greenhorn that was still awkward, but had the hero potential.
His ACC persona didn't look too OOC to me when I considered that he had a similar reaction to something he felt responsible for in his childhood. When he failed to catch Tifa on the bridge, he blamed himself and lead a rather self-destructive path of being a bully and fighting all the time. When he started blaming himself again in CoT/ACC, he became isolated and when he got infested with AIDS Geostigma, he left. That sounded so Cloud.
In the OG, I cannot help to take account his f*cked up persona too, because you can understand how Cloud also viewed some things, like heroism, worth and values. He's supposed to act like a young Dante (DMC3) in terms of personality, while he was a Simon (Gurren Lagann). He longed to be the badass protagonist, while in reality, he was the boy-sidekick. CC did a good job to illustrate that difference in comparison to the OG, IMO.
Also, in the OG, I didn't get much character development for Cloud, as much as character presentation and (re) discovery. The 1st Disk Cloud was a poser, a supposed hardass, aloof and cocky, while the real, Disk 2 and 3 Cloud is shy, VERY emotional and socially crippled. I found his persona consistent to that in ACC, since in the OG, he found his original self, which was a far cry from hero material, but the story gave him little to work on his real self. I think that he got character development in ACC, mostly, where his real personality was challenged to be developed for him to become a better person.
What the real Cloud learned in the OG was that his biggest strength was to admit his weakness. What he learned in ACC was he could use whatever strength he had, as long as he let others in to support him and he would be successful in what he aimed to be.
Cloud alone is a Cloud depressed, weak, taking wrong decisions and lonely (Nojima said that during his days with Geostigma in the church he was lonely), Cloud with support can do anything. That didn't change throughout the Compilation for me.
And this is why I love Cloud as a character, Compilation or not. He's deeply flawed, some of said flaws may never go away, he's damaged, but he has to keep going.
And sometimes, I find the creators' decision to keep Cloud alive at the end of the OG more cruel than kill him along with all humanity with the Lifestream and let them rest. Sometimes.