The Items:
Top rowCrystal - Use to teleport to any activated save statue
and purify/corrupt them.
Lila Shell - Use to contact people in the search party base, or used by them to contact you.
Selceta Medicine - Increase max HP (amount depends on character)
Water-Dragon Scales - Allows you to breathe for longer under water.
Silver Harmonica OR
Hammer - Used to get rid of the Devil's Wind. Item you get depends on your character.
Cannot be used by Toal.Rod -
Used to enter mirrors.Second RowMedals - Open end-of-area boss doors.
Third RowKeys - Open locked doors.
Fourth RowWind MagicThunder MagicFire MagicBracelet 1 -
Grants Dash ability.Bracelet 2 -
Grants Double-jump ability.Evil Ring - Used to open the Devil's Door.
Fifth RowRoda Nut - Give to Roo to be given special items
Cleria Ore - Give to the guy with glasses at the search-party base, and he will increase your weapon level
Seal 1 - Opens up a particular area.
Seal 2 - See above.
Black PearlDream Statue - Used with the Black Pearl in Yunika's scenario to de-petrify your comrades.
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As for the equipment section:
This isn't an exact translation, but just what these items do. Weapon, Armour, Boots and Skill items are self-explanatory, Accessories are:
Mask of EyesWhen you see an red symbol on walls/floors, equipping the Mask of Eyes will reveal hidden doorways or platforms. However, it will also hide any monsters from your vision, so you won't be able to see the enemies.
Blue NecklaceProtects you from evil. Only has two applications that I know of - In the first area you need to equip it to prevent being teleported (you're certainly past that), and later on it will protect you from the adverse effects of equipping the Evil Ring (i.e. dying!). I don't know if it does anything else.
(lit.)
Spirit ClothingWhen equipped, will allow you to regenerate health in by standing still in any area, just as if you were standing outside of the tower.
Silver BellSome monsters will regenerate even when you've killed them (e.g. the skeletal monsters in the sand area). Having the Silver Bell equipped when you do kill them will destroy them permanently.
(lit.)
Earth-Dragon ClawYou will sink in some areas of sand, and otherwise not be able to gain a foot-hold on others. Equipping these will allow you to walk on sand as though it was normal terrain.
Final ItemFrom what I've heard, this item depends on which character you are, but the use is the same. If it's equipped when you are killed, you will come back to life at full health - however, it only works ONCE.
ALTERNATELY WITH TOAL
First Accessory
Increases STR +3 at the expense of DEF -3
Second Accessory
Cuts MP expenditure by a small amount.
(lit.) Spirit Clothing
When equipped, will allow you to regenerate health in by standing still in any area, just as if you were standing outside of the tower.
Silver Bell
Some monsters will regenerate even when you've killed them (e.g. the skeletal monsters in the sand area). Having the Silver Bell equipped when you do kill them will destroy them permanently.
(lit.) Earth-Dragon Claw
You will sink in some areas of sand, and otherwise not be able to gain a foot-hold on others. Equipping these will allow you to walk on sand as though it was normal terrain.
Final Accessory
Increases both STR +5 and DEF +5. Essentially gives you another level.
Hope that helps.