ONE Thing that I would have made different in any Final Fantasy

[Sephiroth]

Which one would it have been? As said, please one idea per game.

Compilation of Final Fantasy VII:

Crisis Core better defined with the main chapter of the Nibelheim Incident. Zack fighting the Dragon and losing in a boss battle, then Sephiroth appearing in CGI graphic and destroying it. The cellar scene NOT just as DMW scene as it is the heart of when Sephiroth becomes evil.

Final Fantasy X Saga:

No Seymour Omnis, Seymour appears after the Aeons and absorbs and controls Yevon=Ju and becomes even more the core of [Sin] and stronger than [Sin] ever was so that he becomes the "savior" and he would be [Sin] not only in a simple form, but the real core of [Sin], even controlling the power that summoned him, and then with "Battle with Seymour" as a spectacular Final Boss theme that I would have called "End of the Cycle", Seymour and thus [Sin] would be wiped out forever.

085 - Seymour Battle / Fight With Seymour ????????? [Final Fantasy X HD Remaster OST] - YouTube



Salvator Seymour
HP: 500 for each activated Sphere Node

Overdrive: Requiem Mundi (Game Over, Spira is extinguished), increases after a certain number of turns, not with actions.

Attacks:

W-Ultima
W-Flare
W-Firaga
W-Blizzaga
W-Thundaga
W-Waterga
Scythe of Death (physical attack on all)
Mighty Guard
All Dispel
Tera-Graviton (HP = 1, blind, mute, curse at all)
Last Rites (takes the Overdrive-energy of a character off completely and charges the own by 25% of the emptied one)

Fabula Nova Crystallis: Final Fantasy XIII Saga:

No plotholes like impossible time paradoxes and confusion of when is talked about the soul and actual existence of a person and not confuse it once by telling the one thing and then the complete opposite or using terms like "allmighty" when the guy isn't. Kefka did that already in the MagiTek Factory and he was just an insane jerk who also got beaten up by a sasquatch for thinking so. And the other 30 characters but this way it sounds better.

The others are leaving out plotholes. I could say that for everything but I wanted to point out some concrete thoughts for the other three so I mentioned them.