...What do you like about Sephiroth?
I, for instance, like the way that, even though he's absent for most of FFVII and AC, his presence was felt everywhere and everything was in turmoil because of him.
I also like the fact that we can see Sephiroth in two prespectives, as an hero and the ominous being that brought despair to the entire world.
His background is also very interesting and, though we got a little bit more info about it with the Compilation titles (specially CC) there's still a lot of mistery surrounding him. That's other thing i like about Sephiroth, that mistery aura that surrounds his character.
I like his personality, too. His calm yet intimidating demeanour; his coldness; his intelligence; his manipulative and a bit saddistic nature; his majestic way of speech...
His japanese voice really gives me chills down my spine. Morikawa really did a good work in catching the essence of Sephiroth's character in his voice. As for George Newbern, he's not bad, but i think that his voice is more suitable for a sane Sephiroth than for the Post-Nibelheim Sephiroth.
In a more plot-specific point, i like how Sephiroth was able to go beyond the laws of Nature and cheat death twice, while at the same time becoming even more powerful, by absorbing the knowledge held in the Lifestream during five years (FFVII) and, through Geostigma, corrupting a large amount of Lifestream and bend it to his will, in a sense creating his own Lifestream and achieving, to an extent, what he wanted to achieve in FFVII.
Wich leads us to his strength. I admire Sephiroth's strength and his skill with the Masamune is truly awesome!
In the fight against Cloud in AC, we can see how fast, strong and skillfull Sephiroth is, since he uses all his physical prowess against Cloud (he was not holding back in terms of pshysical strength as many believe).
The limits of his true power, however, is something that is still unknown.
Even in AC, where Sephiroth reached his highest peak, we only got some glimpses at his formidable power, mainly when he covers the sky over Midgar with the Negative Lifestream with just a wave of his hand and when he brings down the top of Shinra Building by just raising slightly his arms. These two events were two subtle, classy and tasteful ways of showing how powerful Sephiroth is, without falling in exageration.
And not knowing the limits of Sephiroth's power is something i also like about him, since it only serves to increase the mistery aura that is a part of Sephiroth's character.
Concerning Sephiroth's design, i like how they made him a misterious, intimidating yet graceful figure, specially in AC, with his otherworldy and somewhat adrogynous appearence.
I also like his uniform very much, specially its depiction in the Compilation, with a subtle yet classy restyling(the KH versions were horrible, though).
The Masamune is also awesome, even though it has a very simple design, when compared with Genesis' Rapier for instance.
And we can't talk about Sephiroth without reffering his wing. I love his single black wing and the symbolism behind it. It symbolizes Sephiroth's condition as a fallen hero/angel, but, together with his black uniform and his sword, Sephiroth can be seen as an Angel of Death, as a modern interpretation of the Grim Reaper.
In a sense, i'm kinda disapointed that they took Sephiroth's uniqueness as the One Winged Angel to create Angeal and the J-pop version of Sephiroth. Oh well...
Finally, other thing i like about Sephiroth, as I kinda reffered above, is the symbolism behind his character, from his name to his hair.
And because I like Sephiroth so much, i don't want him to return again.
What i've seen of Sephiroth in the past 11 years was more than enough for me.
The only thing that was lacking, at least for me, was to see Sephiroth fighting as the true One Winged Angel, wich will happen in ACC.