
Originally Posted by
Skyblade
I disagree. While he may have been evil from the first time we get to directly see his activities (his friendship with Aule being told secondhand, as it were), we do get to witness changes in his persona while he is evil. Some of it natural development, some of it forced upon him by others.
Sauron's role in the first age and early in the second was that of a manipulator. He was able to guide the elf-smiths of Eregion into working towards his aim with the ring project, and even after his capture at the hands of the Numenorians he was able to corrupt that noble race into attacking the Valar.
Contrast that to his actions at the end of the second age, where he utilized a much more brute-force tactic in attempting to simply overwhelm what was left of Gondor, Arnor, and the elves.
Then, with the loss of the ring, his tactics are forced to change once more. He begins to focus more on power consolidation than anything else. However, once he regains enough of his power to reclaim his fortress of Barad-dur (despite still having no physical form), he does not relinquish this tactic. He tries a few attempts at the manipulation he used in the first and second age, but it fails rather miserably, as he has, quite simply, lost his knack for it as he became more and more corrupted.
He becomes obsessed with the acquisition of more and more power, calling in allies from beyond Middle Earth (the Easterlings and Southrens) to aid him in his quest for domination. These are hard learned lessons from the past and seem to instill in him a sort of paranoia that drives his activities. He martials as many forces as he can to overwhelm his opponents, and begins hunting even more desperately for the Ring. The final battle at the Black Gate displays this more than anything. With Aragorn's success at overthrowing Sauron's hold over the Palantiri, Sauron knows that he faces a will stronger than his own, and one which could succeed in wielding the Ring against him (it would have corrupted Aragorn completely to do so, but Sauron would have been undone), and throws absolutely everything he has at the paltry force facing him because of it, much to his doom.
His character does change and evolve, as reflected in his strategies. Personally, I also believe that the minions of the villains reflect a lot about the villain's personalities. For example, you can tell that Saruman is not as corrupt as Sauron by comparing their respective forces, the Uruk-hai and the orcs. While both are evil, the Uruk-hai have a great sense of duty, and even a form of esprit-de-corps, that is notably lacking from the orcs, as both orcs and Uruk-hai are reflective of the ones shaping them, Saruman and Sauron. By viewing the forces Sauron uses throughout the stories, you can see a couple notable changes even in just LotR. But that's a tale for another time.
On topic, Sephiroth may not have been the best villain, but he was a notable one. At least he had a personality, which gave him a one-up on Seymour,