There's a large variety of different types of items in the bot currently: Healing Items, Battle Items, Consumable (Skill) Items, +Stat Items, Summon Items, Shop Level Reducing Items, Gems, Keys, Accessories, Portal Items and Misc (Crafting) items. Here's a few examples of each.

Restorative items

Most of these will restore a fraction of the target's maximum HP. If used with Fullbring, they will restore a fixed amount instead.

Bottled Fairy - 3000 red orbs, Phoenix Down - 6000 red orbs

These can be used to revive fallen players. They restore different fractions of the fallen target's maximum HP.

GoldOrb - 3000 red orbs

This item, when used, will bestow the target with the Auto Reraise status. If the target dies in the same battle, they will be revived with half of their hp.

Ether - 250 Red Orbs

Ethers will instantly restore TP when used.

Tonic - 1000 Red Orbs

The tonic will instantly cure most status effects. It will not cure Charm or Intimidation though.

Ignition star - 20000 Red Orbs

Ignition stars, when used, will instantly restore some Ignition Gauge.

Battle Items

These items can be used on monsters to deal damage or inflict status effects to them. Some examples are listed below:

Holy water - 100 Red Orbs

The Holy Water will inflict roughly 45 light elemental damage to a target. It can be used with Fullbring and requires level 2 of that skill.

Stop watch - 150 Red Orbs

The Stop Watch will attempt to stop time for target. It can be used wtih Fullbring and requires level 3 of that skill.

Angon - Crafting or Beedle's Shop for 2000 Red Orbs

This item will attempt to inflict the Defense Down status on a target.

Dynamite - Crafting Only

The dynamite will inflict roughly 310 fire damage to a target, boosted by the Demolitions enhancement skill. It can be used with Fullbring and requires level 4 of that skill.

Grapling_Hook - 1000 Red Orbs

This item is used to grab an enemy to use that enemy as a protective shield in battle. When successful, the 'shield' will take damage if you're attacked instead of you.

+Stat Items

These items, when used, will increase your stats or orbs by a certain amount. You cannot buy these items in the shop and must be found by defeating bosses and being the most stylish. None of these items can be used with Fullbring.

To keep a little bit of mystery with these items, I'll list some of them but won't say what they do. If you want to know, get out there and defeat the bosses and be stylish about it.

List

Pizza

PotRoast

Ramen

Cavier

BisonDollar

DragonMeat

SuperMushroom

FireDragonWine

Ambrosia

FoieGras

KnowledgeSource

SoulPainting

FishAndChips

Slurm

CerberusMeat

WereMeat

AlphaWereMeat

SilverApple

Rum

DefenseSource

PowerSource

Herring

TurkeyLeg

BloodyHeart

RottingMeat

BloodScroll

BurntScroll

TreasureMap

BookOfSkulls

Consumable (Skill) Items

These items are used in conjunction with skills and will be consumed when the skill is used.

Shihei - 100 red orbs

This item is used to create shadows using the Utsusemi skill. One shihei will produce 2 shadows.

Sokubaku - 100 red orbs

This item is used with the skill Weapon Lock to lock enemies' weapons for a number of turns.

Hankai - 1000 red orbs

This item is used with the Seal Break skill.

Mirror shard - 3000 red orbs

This item is used with the Magic Mirror skill.

Lockpick - 300 red orbs

This item is used with the Lockpicking skill.

Summon Items

These items only work when the user has the Blood Pact passive skill. The item is consumed upon use but will summon an ally to the battlefield to help fight.

Dark Magician card - 5000 red orbs

This item will summon the powerful mage Dark Magician.

Fish oil broth - 10 000 red orbs

This item will summon the crab Courier Carrie.

Elvish medallian - cannot purchase

This item will summon Lirarian to fight for the heroes.

Bahamut Materia - cannot purchase

This item will summon Bahamut

Poké Ball - 10 000 red orbs

This item will summon one of three Pokémon at random.

Shop Reducing Items

When used, these items will reduce your current shop level by an amount. The shop level can never go below 1.0.

Mini discount card - 60 000 Red Orbs

This item will reduce your shop level by 5.

Discount card - 100 000 Red Orbs

This item will reduce your shop level by 10.

Ultra discount card - 300 000 Red Orbs

This item will reduce your shop level by 30.

Xmas discount card - Santa only with 20 elves saved - 45 000 Red Orbs

This item will reduce your shop level by 5.

Gems

Gems are used to craft items. They can be obtained via treasure chest or by killing a monster via the jewel sword weapon.

Zircon

Topaz

Emerald

Ruby

Sapphire

Opal

Onyx

Diamond

Keys

Keys are obtained at the end of battle after enough wins have been accumulated. They open their respective colored-chests.

Red key

Blue key

Brown key

Orange key

Green key

Gold key

Silver key

Purple key

Black key

Accessories

Accessories are special items that can be equipped. The accessories themselves will grant bonuses or status effects on the wearer. How do you get the accessories? Well, they're rare boss drops from certain bosses or specially crafted. Once you manage to find one, you can equip it with !wear accessory accessory name. If you ever decide that you no longer want to wear that accessory you can remove it with !remove accessory accessory name.

Wizard's amulet

Blessed ankh

Wizard's ankh

Blood ring

Blood pendant

Blood crown

Purple belt

Brown belt

Black belt

Red belt

Miser ring

Thief ring

Fool's tablet

Pink bow

Ribbon

Aztec gold coin

Mayan charm

Lucky rabbit's foot

VIP member card

Spear pin

Sword pin

Axe pin

Mugger's belt

Prism specs

4-leaf clover

Treasure ring

Mimic ring

Engine ring

Roshi's glasses

Hourglass necklace

Jungle medallion

Shield ring

Pendant of Courage

Pendant of Wisdom

Pendant of Power

Armor

Armor can be found via chests, bosses or crafted. Most armor will bestow the wearer a stat increase and some pieces of armor will grant special bonuses in the form of augments that are always on. Once you manage to find a piece of armor, you can equip it with !wear armor armor name If you ever decide that you no longer want to wear that piece of armor you can remove it with !remove armor armor name. There are five slots that you can wear armor on: head, body, legs, feet and hands. The bot will equip the armor in the correct slot when you use the command, you do not need to specify.

Misc (Crafting) Items

These items are used with the alchemy skill to craft items or are seal items that are used to purchase portal items.

Mimic core

Beetle shell

Beetle jaw

Quadav shell

Seed

Deku seed

Rose

Tulip

Milk

Small egg

Hard-boiled egg

Ink

Paper

Ash log

Hatchet

Iron ore

Gold ore

Silver ore

Darksteel ore

Ectoplasm

Ethereal chain

Broken lance

Silver chain

Fire gem

Ice stone

Wind rock

Water jewel

Earth sphere

Jungle thorn

Jungle rose

Glass

Cloth

Repair hammer

TigerFang

Sand

Ancient Beastcoin

Cardinal cloth

Kurogane

Diabolic silk

Dark orichalcum

Atlantian thread

Jewel of Ardor

Jewel of Wieldance

Coin of Balance

Benedict silk

Glittering yarn

Chameleon yarn

Snowy cerment

Utopian gold thread

Demonite ore

Shadow scale

Crimtane ore

Soul of Sight

Soul of Might

Soul of Fright

Chlorophyte ore

Eye of the Golem

Titanium ore

Heavy metal plate

Unkai Seal

Estoqueur Seal

Unkai armor piece

Estoqueur armor piece

Silver sword parts

Beastmen seal

Kindred seal

Kindred crest

High kindred crest

Byakko seal

Genbu seal

Seiryu seal

Suzaku seal

Kirin seal

Runes

Runes are used to augment your weapons with new abilities.

EthRune

MtlRune

HiRune

GeRune

MaRune

TeRune

MeRune

SmnRune

DrnRune

ItmRune

RenRune

NinRune

IgDefRune

DragonRune

TurtleRune

Portal Items

These items are used in battle to transport all of the players to a special battlefield to fight a tough boss monster.

Allied training paper

Worm food

Demon bell

Bomb shard

Armos medallian

Book of Mudora

Hera key

Virility can

Ignis Fatuus

Banishing charm

Rotting orb

News orb

Time orb

Jungle orb

Gem of theNorth

Gem of theEast

Gem of theSouth

Gem of theWest

God seal

Hyrule orb

Lachesis orb

Crimson traverser stone

Old orc sword

Tavnazia pass

Evil guitar

Yagudo drink

Spheroid plate

Avatar blood

Old orc bow

Goddess orb

Atlantian crystal

Suspicious-looking eye

Corrupt worm food

Bloody spine

Dungeon map

Mechanical eye

Mechanical worm

Mechanical skull

Plantera's bulb

Lihzahrd power cell

Truffle worm

Songsheets

Songsheets are items used to teach songs. Use them on yourself to learn the song (such as !use Songsheet:Knight'sMinne on player). Note that not all songsheets are available from the merchant, some must be acquired other ways.

Songsheet:Knight'sMinne

Songsheet:Army'sPaeon

Songsheet:FoeLullaby

Songsheet:ToxicMelody

Songsheet:SongOfPeace

Instruments

Instruments can be purchased from the song merchant and are necessary to perform songs.

Lute

Harp

Flute

Ocarina

Mech Items

These items are used to repair or equip your mech.

Weapons

Basic mech gun

Improved mech gun

Flawless mech gun

Darksteel ore cannon

Basic mechsword

Improved mech sword

Flawless mech sword

Darksteel ore sword

Basic mech fists

Improved mech fists

Flawless mech fists

Darksteel ore fists

Basic mech staff

Improved mech staff

Flawless mech staff

Darksteel ore staff

Cores

Basic mech core

Ethereal core

Magic amplifier

Asher guns

Reuben katanas

Dinah weapons

Delphinus weapon systems

Repair

E-Tank

Metal scrap

E-Tank A

E-Tank B

E-Tank T

E-Tank Z

Frame repair A

Frame repair B

Frame repair E

Frame repair Z