Sephiroth was gummispace. He was everywhere and nowhere, here here here and not not not, leading you around in circles, if you even want to follow him, which most don't.
Sephiroth was dark, not black or white or grey, because he's every color and no color and white black green grey blue red orange yellow silver gold tan purple brown and bright bright bright coming at you in waves of hair and skin and eyes and clothes and power that all ripple together and crash (boomboomBOOM!) on you all at once.
Sephiroth was gummispace, without any friendly worlds at all.
A/N - Yes, this helped spawn the title. XD The other one was Naminé's, but I'll probably do a more specific "pebble" drabble at some point. Most likely when I get to the little world-specific characters (like Huey, Dewy, and Louis...hm...). Anyway, yeah, this one was fun to write. XD