Gummi Blocks in Kingdom Hearts come in a variety of forms and types that affect a Gummi Ship's stats and abilities during flight.
There are seven broad categories of Gummi Blocks, each with a primary function regarding the Gummi Ship's performance and/or appearance. Gummi Blocks may be obtained from Treasure Chests, rewarded for completing side quests or mini-games, dropped by destroyed enemy Gummi Ships or purchased from Cid's shop in the First District.
Additionally, there are a number of tools available for purchase from Cid that facilitate Gummi Ship building or otherwise power up the ship.
Mechanics
Cockpit Gummis (コクピットグミ Kokupitto Gumi) have various effects focused on replenishing the Armor Gauge. True to their name, the Cockpit Gummis contain the Gummi Ship's cockpit, from which Donald flies the ship; as such, a Gummi Ship must include one Cockpit Gummi in order to be flown. Each block has a different shape, but each of them is red with blue windows. Cure-G (ケアルグミ Kearu Gumi) and the more powerful Curaga-G (ケアルガグミ Kearuga Gumi, lit. "Curega Gummi") increase the effectiveness of Armor prizes, while Life-G (レイズグミ Reizu Gumi, lit. "Raise Gummi") and the stronger Full-Life-G (アレイズグミ Areizu Gumi, lit. "Arise Gummi") will replenish a certain amount of the Armor Gauge one time after it is completely depleted.
Engine Gummis (エンジングミ Enjin Gumi) control the speed and horsepower of the Gummi Ship, while also providing a bonus to the Armor Gauge. As such, every Gummi Ship requires at least one Engine Gummi in order to move. Each block has a slightly different shape, but is essentially a grey nozzle attached to a red casing. The Engine Gummis gradually increase in size, armor bonus, and speed range as they increase in horsepower, from the basic Fire-G (ファイアグミ Faia Gumi), through the Fira-G (ファイラグミ Faira Gumi), Firaga-G (ファイガグミ Faiga Gumi, lit. "Figa Gummi"), and Flare-G (フレアグミ Furea Gumi), and finishing with the powerful Holy-G (ホーリーグミ Hōrī Gumi).
Armor Gummis (シールドグミ Shīrudo Gumi, lit. "Shield Gummi") increase the length of the Gummi Ship's Armor Gauge, and come in eight different shapes. Each shape can be found in three strengths, from the weak Protect-G (プロテスグミ Purotesu Gumi), to Shell-G (シェルグミ Sheru Gumi), and finally Dispel-G (デスペルグミ Disuperu Gumi). Protect-G are red and are the only ones that can be purchased from the Gummi Shop, Shell-G are red with white trim, and Dispel-G are red with jagged white trim.
Wing Gummis (ウィンググミ Wingu Gumi) improve the maneuverability of the Gummi Ship, while also providing a bonus to the Armor Gauge. The Wing Gummis gradually increase in size and armor bonus as they increase in handling, from the basic Aero-G (エアログミ Earo Gumi), through the Aerora-G (エアロラグミ Earora Gumi), Aeroga-G (エアロガグミ Earoga Gumi), and Float-G (レビテトグミ Rebiteto Gumi, lit. "Levitate Gummi"), and finishing with the agile Tornado-G (トルネドグミ Torunedo Gumi). The Wing Gummis are all red panels of various tapered shapes that generally come in mirrored pairs for both sides of the ship, and the Aero-G and Aerora-G are the only ones that can be purchased from the Gummi Shop.
Special Gummis (オプショングミ Opushon Gumi, lit. "Option Gummi") bestow various special abilities to the Gummi Ship while also providing a bonus to the Armor Gauge, but consume energy from the Power Gauge when used. All Special Gummis can be obtained from Cid, either through the Gummi Shop or as a gift. Drain-G (ドレイングミ Dorein Gumi) can grab one item at a time from an extended range, and are grey robotic claw-arms with yellow stripes embedded in red blocks that come in a mirrored pair for both sides of the ship. Osmose-G (アスピルグミ Asupiru Gumi, lit. "Asper Gummi") can grab multiple items at a time from an extended range, and are grey robotic net-arms with yellow stripes embedded in red blocks that come in a mirrored pair for both sides of the ship. Esuna-G (エスナグミ Esuna Gumi) illuminate the objects hidden along the routes, and are grey floodlights; the weaker rectangular Esuna-G can only reveal a few hidden items, while the more powerful circular Esuna-G can reveal even the rarest. Scan-G (ライブラグミ Raibura Gumi, lit. "Libra Gummi") display nearby enemy ships on a radar screen, and are grey sensor arrays on red struts with yellow details; the parabolic dish Scan-G can only detect enemies in the direction it is aimed at, while the omnidirectional sensor Scan-G can detect enemies in any direction. Shield-G (バリアグミ＆ウォールグミ Baria Gumi & Wōru Gumi, lit. "Barrier Gummi & Wall Gummi) allow the Gummi Ship to use the Shield Gauge, which incurs damage in place of the Armor Gauge until it is depleted; the basic Shield-G is a green block with a blue plate on one side covered by a bubble and only protects a small region of the Gummi Ship, while the more powerful Shield2-G has blue plates and bubbles on opposite sides and protects the entire ship. Haste-G (ヘイストグミ Heisuto Gumi) allow the Gummi Ship to use the Charge Gauge, which temporarily accelerates the ship when 
is pressed; the basic Haste-G resembles a red hot rod's engine block with grey tubing, while the more powerful Haste2-G resembles a red jet turbine with grey fans. The final two Special Gummi, received by helping Cid, have even more esoteric abilities; the Warp-G (テレポグミ Terepo Gumi, lit. "Teleport Gummi") is a transparent cube with red edges containing a green spherical core that allows the Gummi Ship to instantly teleport from the current world to another, regardless of distance, while the Transform-G (チェンジグミ Chenji Gumi, lit. "Change Gummi") is a red cube with yellow circuitry that allows the Gummi Ship to transform from its current design into a second, previously created arrangement.
List of Gummi Blocks
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Origin
Nearly all Gummies are named after spells from the Final Fantasy series, many of which were later incorporated into the Kingdom Hearts series.
The four types of Cockpit Gummis are named after restorative spells: "Cure" and "Curaga", which restore HP, and "Life" and "Full-Life", which restore HP to expired targets.
The five types of Engine Gummis are named after fire-based offensive spells: "Fire", "Fira", and "Firaga", which attack the enemy with flames, "Flare", which nukes the enemy with atomic flames or a non-elemental explosion, and "Holy", which bathes the enemy with white-hot light and is usually the White Magic-counterpart to Flare.
The three types of Armor Gummis are named after protective spells: "Protect", which traditionally adds protection against physical damage, "Shell", which adds protection against magical damage, and "Dispel", which eliminates positive status effects and certain negative status ailments from its target.
The five types of Wing Gummis are named after wind-based spells: "Aero", "Aerora", and "Aeroga", which can either defend the user with a barrier of wind or attack the enemy with a miniature twister, "Float", which allows the user to stay in the air longer while jumping, and "Tornado", which attacks the enemy with a gargantuan twister.