The_Oathkeeper
Why so serious?
I'm not really sure where you got the idea that controlling the Negative Lifestream is a world-destroying ability. If Sephiroth could've used the Negative Lifestream to destroy the planet or even significantly damage it, I think he would've, even if he did want to toy around with Cloud for a while. Remember, his intended goal was to render the planet uninhabitable and use it as a vessel to travel the stars. I'm guessing this involves removing the life from the planet first. However, the most Sephiroth ever did in the way of large-scale effects on his environment was to create a storm over the ruins of Midgar. Other than that, he doesn't really have anything in the way of destructive powers, at least not compared to the other villains in the series. If anything, he's never shown the ability to destroy an entire planet by force, only to damage it through a disease (Geostigma), which would definitely not be effective in an all-out battle. Even the Lifestream itself has never shown itself capable of mass destruction of any sort, and the Negative Lifestream (which is what Sephiroth controls) only makes up a fraction of the overall Lifestream.
I don't see where you get the idea that Sephiroth has instant regeneration, either. He never once displays that ability in the entirety of the FFVII Compilation, and certainly not in Advent Children. It's true that he can turn intangible, which would probably do him a great deal of good against opponents who primarily fight using physical attacks, but he's never moved very fast while intangible. The most he ever did was to slowly phase through the floor, so I can say with relative certainty that intangibility wouldn't be an instant-win for Sephy by any means. I could only see him using it as a defense against fighters using physical weapons as their primary means of attack, which would probably be more effective when fighting against the sword-wielding heroes rather than the typical spellcasting villains. On the subject of instant regeneration, though, where do you get that? If Sephiroth had the ability to regenerate, I think he would've used it to recover from Cloud's Omnislash. Any regeneration he has would have to be incredibly weak.
If you mean when Sephiroth regenerated his body, then yes, he does have the ability to regenerate in some sense of the word. However, the first time he regenerated, it took him a total of about five years to do so without any help. I doubt that'd be at all useful in a one-on-one battle, considering, by the time he revived himself, his target would be back to full health. The second time he regenerated, he needed two things: a physical host (Kadaj) and a large concentration of JENOVA Cells (JENOVA's head). For Sephiroth to regenerate his body, those two circumstances must be fulfilled. Again, not something he can readily do in a combat situation. I mean, all of the Jenova Cells except those in people who went through the SOLDIER treatment (who are supposed to be strong enough to withstand Jenova's influence, anyway) have pretty much been wiped out, so even that isn't an option for Sephiroth.
So yeah, he does have the ability to turn intangible, but it wouldn't be horribly useful against a powerful/fast opponent, and he sort of has regeneration, but again, it couldn't be used effectively in combat...well, not unless a suitable host and a large concentration of Jenova Cells happen to wander onto the battlefield...
I don't see where you get the idea that Sephiroth has instant regeneration, either. He never once displays that ability in the entirety of the FFVII Compilation, and certainly not in Advent Children. It's true that he can turn intangible, which would probably do him a great deal of good against opponents who primarily fight using physical attacks, but he's never moved very fast while intangible. The most he ever did was to slowly phase through the floor, so I can say with relative certainty that intangibility wouldn't be an instant-win for Sephy by any means. I could only see him using it as a defense against fighters using physical weapons as their primary means of attack, which would probably be more effective when fighting against the sword-wielding heroes rather than the typical spellcasting villains. On the subject of instant regeneration, though, where do you get that? If Sephiroth had the ability to regenerate, I think he would've used it to recover from Cloud's Omnislash. Any regeneration he has would have to be incredibly weak.
If you mean when Sephiroth regenerated his body, then yes, he does have the ability to regenerate in some sense of the word. However, the first time he regenerated, it took him a total of about five years to do so without any help. I doubt that'd be at all useful in a one-on-one battle, considering, by the time he revived himself, his target would be back to full health. The second time he regenerated, he needed two things: a physical host (Kadaj) and a large concentration of JENOVA Cells (JENOVA's head). For Sephiroth to regenerate his body, those two circumstances must be fulfilled. Again, not something he can readily do in a combat situation. I mean, all of the Jenova Cells except those in people who went through the SOLDIER treatment (who are supposed to be strong enough to withstand Jenova's influence, anyway) have pretty much been wiped out, so even that isn't an option for Sephiroth.
So yeah, he does have the ability to turn intangible, but it wouldn't be horribly useful against a powerful/fast opponent, and he sort of has regeneration, but again, it couldn't be used effectively in combat...well, not unless a suitable host and a large concentration of Jenova Cells happen to wander onto the battlefield...