Let's discuss Iris Havengard

I think WallChange or Forcefield alone is not very strong once you reach the WoR since elemental resistances are generally easy enough to come by.  Even if Iris' version of Forcefield only affects the party, I'm probably already wearing Thunder Shields for the Gold Dragon and Flame Shields for Poltergeist, and having to spend an average of four turns to disable the desired element is basically forever in vanilla (not mention the risk of disabling an element that you actually want to use).  A Forcefield where you could choose which element to disable would be quite powerful, but it's reasonable IMO given the other options at your disposal.

I think that a Magic Sword that merely adds an elemental attribute to weapon strikes would be nearly useless until after the Phoenix Cave if it could only be applied to swords.  The support for using Fight in FF6 is just too weak until your level gets high and you have the Offering/Atma Weapon and/or Illumina.  I think this could be cooler if Magic Sword allowed you to pick any spell Iris knows and it would proc 100% of the time upon attacking.  I'm sure this would be harder than adding the elemental property to her weapon, but it doesn't sound outside the realm of possibility to me.  It's a powerful offensive option, but also usually not much more powerful than simply casting the spell and also requires Iris to be in the front to use effectively, which is normally a bad decision.

I think providing a menu with a handful of miscellaneous unique abilities wouldn't be the most exciting on its own since the other characters have some sort of gimmick as to how they acquire or use those abilities.  I feel like we'd need some way to spice it up a little.

I'd be glad if somebody was willing to take up the reins on this project, though I don't see myself doing that anytime soon.