Is it possible to copy Sephiroth's AI-controlling script on other characters? Did anyone figure out after 25 years the mechanics of Sephiroth (and Young Cloud/Zack) stats growth curve and why stats increasing sources do not work on Sephiroth (do not increase his stats)?
Yes, i never tried, but in the practice, Sephiroth its like any other character, more or less.
For the stats, i dont know, i suppose that Sephiroth use the same curve as Vincent or that information its inside the FF7.exe file ,Sephiroth, has some conditional restrictions that i think are in that file, for example, that you cant touch his items in the past of Cloud.