I appreciate all the effort put into your CS! It looks good, although the question of making Sephiroth 'level one' is a difficult one, to be sure.

You did mention how he performs in Smash. In Smash, he's got a lot of power and range, but while his movement speed is fast his frame data is on the slow side, and some of his moves have a lot of recovery. He's also on the lighter side, able to be launched without much difficulty. This could make him into a fighter in World of Light with obvious strengths but also obvious weaknesses, and maybe lead to a personal angle where Sephiroth is frustrated by the damage he keeps taking when he knows he should be better than this.

'Expert Combatant' and 'Superhuman' describe who he is, but not how he'll perform at the beginning. Levels [i]are[/i] power for NPCs, so at the beginning, if Sephiroth were to fight, say, Tora and Poppi, two level eight characters, he would be trounced despite the incredible difference in their canon strength. As cool as it would be, he can't exactly make his entrance by slicing through a boss, either. If this if fine, then Sephiroth is accepted! Post the sheet in Characters tab and I'll send you a PM about an entry point.