Fullbottles

Full Bottles (フルボトル) are the sample bottle-like collectible devices used by the transformation gear in Kamen Rider Build.

Overview
Full Bottles seemingly contain the power, or "Essence" of whatever animate/inanimate object they are based off of, presumably due to their status as a purified byproduct from the Smash. Sento Kiryu has created the Build Driver for use with them in order to transform into Kamen Rider Build.

After Build defeats a Smash, he absorbs its monster essence away from the person into a blank Full Bottle (white cap, empty), turning it into its impure form (white cap, relevant color inside), the bottle part being bulbous and with a black spiderweb pattern on it. Through a mysterious power held by Misora Isurugi and a modified microwave machine at the nascita basement, the Smash's harmful properties are purified, leading to the creation of a purified Full Bottle which can then be used by Build.

Functionality
Two Full Bottles are used at once in the Build Driver, one organic and one inorganic. Any pair of organic and inorganic Full Bottles can be used to create a Trial Form, but each Full Bottle has a Best Match with another one, creating a perfect combination of powers. If they are used together, they create an especially powerful Best Match form.

Kamen Rider Claws uses only the Dragon Full Bottle to transform, by inserting it into an adapter called the ClawsDragon, and inserting it into the Build Driver.

Night Rogue and Blood Stark use Full Bottles to transform by inserting them into the Transteam Gun.

Full Bottles may be inserted into certain weapons such as the Drill Crusher or Beat Clawser to activate special finisher attacks. The Lion Full Bottle is used to turn the BuildPhone from phone to bike mode.

Full Bottles can also be utilized to give their users in civilian form temporary superhuman abilities by shaking them. (Ex. The Rabbit Full Bottle gives Sento temporary super speed and agility to evade attacks.)

Unused Full Bottles
Hacking the pin combinations on the DX Build Driver toy reveals sounds for Full Bottles and Best Matches currently not set to be used as real forms or toys.
 * Kyouryuu (恐竜) & F1: "Are you Ready? Onsoku no Teiou! F1Saurus! Yeahhh!"
 * Same (鮫) & Bike (バイク): "Are you Ready? Dokusou Hunter! SameBike! Yeahhh!"
 * Spider (スパイダー) & Reizoko (冷蔵庫): "Are you Ready? Reikyaku no Trap Master! SpiderCooler! Yeahhh!"
 * Turtle (タートル) & Watch (ウォッチ): "Are you Ready? Toki no Kagerukatchuu! TurtleWatch! Yeahhh!"
 * Kabutomushi (甲虫) & Camera (カメラ): "Are you Ready? Mitsurin no Scoop King! BeetleCamera! Yeahhh!"
 * Tora (虎) & UFO (ＵＦＯ): "Are you Ready? Mikakunin Jungle Hunter! ToraUFO! Yeahhh!"
 * Phoenix (フェニックス) & Robot (ロボット): "Are you Ready? Fujimi no Heiki! PhoenixRobo! Yeahhh!"
 * Kujira (鯨) & Jet (ジェット): "Are you Ready? Arakureru Big Wave! KujiraJet! Yeahhh!"
 * Unicorn (ユニコーン) & Keshigomu (消しゴム): "Are you Ready? Ikkaki Shoukyou! UniRaser! Yeahhh!"
 * Obake (お化け) & Magnet (マグネット): "Are you Ready? Samayou Chouinryoku! MagGhost! Yeahhh!"
 * Shika (鹿) & Pyramid (ピラミッド): "Are you Ready? Ouke no Mamorigami! ShikaMid! Yeahhh!"
 * Rose (ローズ) & Helicopter (ヘリコプター): "Are you Ready? Jounutsu no Senpuuki! RoseCopter! Yeahhh!"
 * Bat (バット) & Engine (エンジン): "Are you Ready? Ankou no Kidoubou! BatEngine! Yeahhh!"
 * Hachi (蜂) & Sensuikan (潜水艦): "Are you Ready? Shinkai no Shigotojin! HachiMarine! Yeahhh!"
 * Sai (犀) & Dryer (ドライヤー): "Are you Ready? Chounutsu Tairiku! SaiDryer! Yeahhh!"
 * Scorpion (スコーピオン) & Gold (ゴールド): "Are you Ready? Kouki naru Dokubari! GoldScorpion! Yeahhh!"
 * Wolf (ウルフ) & Sumaho (スマホ): "Are you Ready? Tsunagaru Ippiki Ookami! SumahoWolf! Yeahhh!"
 * Kuma (熊) & Terebi (テレビ): "Are you Ready? Hachimitsu High Vision! KumaTerebi! Yeahhh!"
 * Dog (ドッグ) & Mic (マイク): "Are you Ready? Yakki no Daibakuon! DogMic! Yeahhh!"
 * Kirin (麒麟) & Senpuki (扇風機): "Are you Ready? Arashi wo Yobukyotou! KirinCyclone! Yeahhh!"
 * Crocodile (クロコダイル) & Rimokon (リモコン): "Are you Ready? Mizugiwa no Denpa yarou! CrocodiCon! Yeahhh!"
 * Penguin (ペンギン) & Sukebo (スケボー): "Are you Ready? Kouri no Suberigei! PenguinSkater! Yeahhh!"
 * Buttobasoul (ブットバソウル) & Ganbarizing (ガンバライジング): "Are you Ready? Kikaijikake no Touginjou! ButtobaGanba! Yeahhh!"
 * Kappumen (カップ麺) & Energy Drink (エナジードリンク): "Are you Ready? Soukou Genki! CupEnergy! Yeahhh!"
 * Cake (ケーキ) & Santa Claus (サンタクロース): "Are you Ready? Seinaru Shisha! MerryChristmas! Yeahhh!"
 * Ghost (ゴースト) & Ex-Aid (エグゼイド): "Are you Ready? Batchi Level Up! GhostEx-Aid! Yeahhh!"
 * Wizard (ウィザード) & Fourze (フォーゼ): "Are you Ready? Maho no Jyuryoko! FourzeWizard! Yeahhh!"