A miracle you say? Yes it is.

YouTube - A Tribute to Kingdom Hearts Sephiroth

I found its version of Sephiroth. For one, Mr. voice of Superman (from S::TAS and JL/U) does a much better job than he did in Advent Children.
His design is quite stunning as well; best since the original FF7.

I like he's enigmatic also. There's no really telling what he is. Yes he's labeled the dark part of Cloud and his past but he's also said to have once been a hero in Mr. Cricket's journal.

Anyway I much prefer him being the KH version of Pyramid Head to an alien hybrid who comes back because his will is the bestest.

BTW, I made that vid. It's nothing special but I gave it a shot.