Cross-Z Dragon

The Cross-Z Dragon (クローズドラゴン) is a small dragon-like flying robotic companion created by Sento Kiryu to assist Ryuga Banjou, complimenting his Dragon Fullbottle. It also functions as a slot adapter for the Build Driver, which Ryuga uses to transform into Kamen Rider Cross-Z and as the slot adapter in the Twin Breaker for Cross-Z Charge to perform a finisher.

History
Created by Sento Kiryu, the Cross-Z Dragon was introduced to Ryuga as they pursued Faust's base beneath the Nebula Gas at the Sky Wall. Eluding the Guardians, the Cross-Z Dragon sucked out the poison from Ryuga inflicted by Blood Stalk.

Accompanying Sento and Ryuga to Hokuto, the Cross-Z Dragon aided Ryuga in covering Sento when he was beaten by Blood Stalk. Recovering the Gatling Fullbottle, the Cross-Z Dragon channeled its power to assault Blood Stalk. Though singed in the crossfire, Ryuga was nonetheless able to take the Rocket Fullbottle from Blood Stalk's Transteam Gun and give it to Build, allowing him to turn the tide.

When most of the Fullbottles were taken by Night Rogue, leaving only the Lock and Dragon Fullbottles, Sento thought of a way for Ryuga to transform by synchronizing with the Cross-Z Dragon, since Ryuga's Hazard Level had just reached a level of 3, while Build's KeyDragon form was too unstable for Sento to use. Ryuga was eventually able to use the Cross-Z Dragon with the Dragon Fullbottle to transform into Cross-Z for the first time, with the immense power of the Dragon Fullbottle enabling him to defeat the Stretch Smash in just one hit.

Design
The Cross-Z Dragon is composed of the following parts:
 * The Blaze Chucker (ブレイズチャッカー) is a flame emitting device incorporated in the head of the Cross-Z Dragon. When spraying a fire, you can fine-tune its temperature and attack range, so you can grill the object at will.
 * The Capri Fang (カプリファング) is the Cross-Z Dragon's fang. Although it is small, the tip is very sharp and can be used for attack. In addition, it has a detoxification function, and imbibing/decomposing poison by biting a person to be cured.
 * The CZ Dragon Head (CZドラゴンヘッド) is the Cross-Z Dragon's head. The growth type AI unit Trust Bringer (トラストビリンガー) is built inside. Also, monitors the state of Ryuga Banjou's body and mind, and if it meets the condition, unlocks the transformation function etc. loaded.
 * The Volkennick Charger (ボルケニックチャージャー) is a special reaction blast furnace mounted on Cross-Z Dragon. In addition to generating the operating energy of the Cross-Z Dragon, it is possible to heat the captured trans gel solid at an extremely high temperature and double its component amount. Also, by using the ingredients of the bottle, you can increase the power of the flame to exhale through the mouth.
 * The Fullbottle Slot (フルボトルスロット) is a slot when a Fullbottle is inserted. It has the role of activating the Transgel Solid (トランスゲルソリッド) in the loaded bottle with a special pulse and taking it inside.
 * The Heat Gail Wing (ヒートゲイルウィング) is the Cross-Z Dragon's exothermic flight unit. It is possible to flight and float freely by controlling the air flow with flapping flames that generate hot air.
 * The Tornado Tail (トーネードテイル) is the Cross-Z Dragon's tail. It has a role as a posture control device, and stable flight can be achieved by swinging up and down and right and left.
 * The Iraption Leg (イラプションレッグ) is the Cross-Z Dragon's legs. Because it incorporates a small power cylinder, if it is an object of 50 kg or less, you can carry it on your back. It is excellent in heat resistance and it is possible to walk loose on the lava.

Powers and Abilities

 * Music: The Cross-Z Dragon will randomly play one of two short music tunes for no particular purpose, whether convenient for sneaking around or not. This can be seen as a possible way of it to either communicate or distract an opponent.
 * Dragon Fire Breath: The Cross-Z Dragon is capable of breathing fire, similar to Dragreder's Drag Breath.
 * Poison Absorption: The Cross-Z Dragon can extract liquid poisons from the infected person's body by biting their necks.
 * Fullbottle Augmentation: Like its creator and partner, the Cross-Z Dragon is capable of utilizing new abilities based on what Fullbottle is plugged into its slot through its Cross-Z Flame (クロズフレーム) attack.
 * Organic:
 * Dragon: The Cross-Z Dragon can fire blasts of blue energy that give off shockwaves on impact.
 * Inorganic:
 * Gatling: The Cross-Z Dragon can consecutively shoot blue fire bullets from its mouth.

Transformation
The user inserts the Dragon Fullbottle into the Fullbottle Slot on the Cross-Z Dragon, folds the CZ Dragon Head and Tornado Tail, and inserts the Cross-Z Dragon into the Build Driver. After cranking the Vortex Lever, the Driver then initializes the Snap Ride Builder (スナップライドビルダー) after the essences have hardened into the Halfbodies, snapping the two parts together and completing the transformation. The Snap Ride Builder will not appear if the user is moving during the transformation, while in some instances, the pneumatic tubes of the Snap Rider Builder will simply appear in a quick flash so as to speed up the transformation.

Build Driver
After cranking the Vortex Lever, Cross-Z performs the Dragonic Finish (ドラゴニックフィニッシュ): This attack has two variations:
 * Rider Kick: Cross-Z summons a blue and orange energy chinese dragon that flies behind him, then jumps up as the dragon breaths fire, sending him at the enemy, then delivers a roundhouse kick whilst his foot is covered in blue energy.
 * Rider Punch: Cross-Z coats his right hand in energy in the shape of a blue chinese dragon head, then delivers a punch.

Twin Breaker
By plugging the Cross-Z Dragon in the Twin Breaker, Cross-Z Charge can perform different finishing attacks depending on what mode it's in.
 * Beam Mode:
 * Let's Finish (レッツフィニッシュ):
 * Attack Mode:
 * Let's Break (レッツレイク): Cross-Z Charge summons a blue and orange energy chinese dragon that flies behind him, and use it to stab the enemy.

Beat Closer + Twin Breaker
Cross-Z Charge can combine the powers of the Beat Closer and the Twin Breaker to perform a powerful finisher.
 * Mega Slash/Let's Break (スクラップブレイク/レッツレイク): Cross-Z Charge channels the energy of the Cross-Z Dragon in the Twin Breaker in Attack Mode, and the energy of a Fullbottle in his Beat Closer, pulls the handle three times and performs a powerful slash.
 * Lock: The Beat Closer projects an energy version of the Bind Master Key before Cross-Z Charge slashes with it, creating a ball of golden energy before summoning a blue and orange energy chinese dragon that grabs the ball via its mouth, then flies at the enemy with an empowered attack.

Sclash Driver + Twin Breaker
Cross-Z Charge can combine the Twin Breaker’s finisher with the Sclash Driver to perform a powerful finisher.
 * Scrap Break/Let's Break (スクラップブレイク/レッツレイク): Cross-Z Charge summons a blue and orange energy chinese dragon that flies behind him, and use it to stab the enemy before delivering a powerful punch.

Portrayal
The Cross-Z Dragon is voiced by KORBY, who also voices the Build Driver.