The GameBoy Advance version, “FFV Advance” added 4 extra Jobs, a bonus dungeon, and more monsters and items. Backporting most of these to the SNES version would require extensive work, yet the items are the most viable by far… because the original game has 30 dummy items!

15 unused weapons (8 characters for name, 1 for icon)

15 unused armor items (same, 9 bytes for the icon+name seen in Item menu and elsewhere)

List of FFVA Exclusive Items

• Weapons = 10
  • Gladius ☑️
    • Agility 2, Attack 115
    • can be used with "Spellblade"
    • can be worn by: All except MN, WM, OR
    • sell: 5
  • Kagenui (Ninja Sword) ☑️
    • Agility 3, Attack 123, sometime casts "Stop"
    • can be used with "Spellblade"
    • can be worn by: NJ
    • sell: 5
  • Apocalypse ☑️
    • Attack 139
    • can be used with "Spellblade", can be equipped with two hands
    • can be worn by: KN, GD
    • sell: 15000
  • Ultima ☑️
    • Strength 2, Agility 2, Stamina 2, Attack 177
    • can be used with "Spellblade", can be equipped with two hands
    • can be worn by: KN, MK, BLM, RM, CN, GD
    • sell: 5
  • Mutsunokami (Katana) ☑️
    • Attack 139
    • can be equipped with two hands
    • can be worn by: SM
    • sell: 5
  • Longinus (Spear) ☑️
    • Strength 2, Attack 129, doubles "Jump" power when equipped
    • can be worn by: DG, GD
    • sell: 5
  • Earthbreaker (Axe) ☑️
    • Strength 5, Stamina 5, Attack 130
    • can be equipped with two hands
    • can be worn by: BR, GD
    • sell: 5
  • Fairy's Bow ☑️
    • Attack 127, sometimes confuses enemies
    • can be worn by: RG, GD
    • sell: 5
  • Mace of Zeus (Rod, weirdly) ☑️
    • Magic 3, Attack 75
    • can be equipped with two hands
    • can be worn by: SR, BM, BLM, TM, MM, RM, NM
    • sell: 5
  • Demon's Rod ☑️
    • Magic 2, Attack 52, poisons target as well
    • same power from back row
    • can be worn by: SR, BM, BLM, TM, MM, RM, NM
    • sell: 5
• Armor & Relics = 10 + 2
  • Cursed Ring ❎
    • in Pyramid! only one that’s not in Bonus Dungeon
    • already in game, just unused
  • Cursed Shield ❎
    • planned for FFV, not implemented
    • already in game, just unused
    • description even exists!
  • Force Shield ☑️
    • Agility -5, Defense 15, Evade 10%, Add Weight 15
    • strong against all elemental attacks
    • can be worn by: KN, DG, SM, BR, MK, BLM, CN, GD, MM
    • Sell: 5
  • Royal Crown (all jobs) ☑️
    • Agility 1, Magic 1, Defense 13, Evade 5%, Magic Defense 13, Add Weight 8
    • worn by: All
    • Sell: 5
  • Grand Helmet ☑️
    • Defense 18, Magic Defense 2, Add Weight: 6
    • can be worn by: KN, DG, SM, BR, MK, GD, MM
    • Sell: 5
  • Vishnu Vest ☑️
    • Defense 20, Magic Defense 8, Add Weight: 3,
    • strong against all elemental attacks
    • can be worn by: KN, MN, TF, DG, NJ, SM, BR, RG, MK, BLM, RM, BS, CH, DC, CN, GD, MM
    • Sell: 5
  • Maximillian (Plate) ☑️
    • Stamina 2, Defense 27, Magic Defense 5, Add Weight: 9
    • can be worn by: KN, DG, SM, BR, MK, GD, MM
    • Sell: 5
  • Robe of Lords ☑️
  • Sorcerer's Mantle ☑️
  • Hyper Wrist ☑️
  • Chaos Orb ☑️
  • Crystal Orb ☑️
• Cannonneer consumables - 3 not important at this time

How / Where to Add These

1. Exdeath vs Galuf
2. Carbuncle
3. Melusine
4. Pyramid
5. Sekhmet
6. Odin
7. Bahamut
8. Stalker (Wendigo)
9. Minotaur
10. Omniscient