|This article is about a/an half form in Kamen Rider Build.|
In any form that uses the Kujira Fullbottle, Build is armed with the Navy Chest Armor (ネイビーチェストアーマー Neibī Chesuto Āmā) for protection against water pressure, and the BLD Spout Glove (BLDスパウトグローブ BLD Supauto Gurōbu) on his right hand for a water-based shooting attack.
- Navy Head Armor (ネイビーヘッドアーマー Neibī Heddo Āmā) - The navy blue head armor. It has thick armor with excellent pressure resistance, allowing the user to dive and descend underwater.
- Left Eye Kujira (レフトアイクジラ Refuto Ai Kujira) - The eyepiece. It makes detailed graphics of seabed topography by cooperating with an ultrasound unit on the BLD Whale Shoulder. The graphics are displayed on an internal monitor. By using this function, the user can fight even in low visibility areas.
- Tail Face Module (テイルフェイスモジュール Teiru Feisu Mojūru) - The 'tail' on the Left Eye Kujira. It records combat data. It also records things such as dolphins playing in the sea and compiles it into a documentary format for the user's personal enjoyment.
- BLD Signal (BLDシグナル BLD Shigunaru) - A data collection device located on the forehead area. It not only collects combat data, but also performs emergency repairs on the body when necessary. Additionally, it can project any information holographically.
- Navy Chest Armor (ネイビーチェストアーマー Neibī Chesuto Āmā) - The navy blue chest armor sections. It has thick armor with excellent pressure resistance, and a propulsion device is built in, allowing the user to move at high speed underwater.
- BLD Whale Shoulder (BLDホエールショルダー BLD Hoēru Shorudā) - The right shoulder armor. It is quipped with an ultrasound unit that allows the user to communicate with whales. The user can also paralyse enemies using the ultrasound unit.
- Big Wave Arm (ビッグウェイブアーム Biggu U~eibu Āmu) - The right arm. A transfer device that is connected to seas and dams suck up seawater and supplies it to the BLD Spout Glove.
- BLD Spout Glove (BLDスパウトグローブ BLD Supauto Gurōbu) - The right hand. Seawater supplied by the Big Wave Arm can be ejected vigorously to startle and push back enemies. The momentum of the water can be controlled, allowing it to be used as a sort of water cutter.
- BLD Unlimited Suit (BLDアンリミテッドスーツ BLD Anrimiteddo Sūtsu) - The shock-resistant bodysuit. Along with protecting the wearer’s body, there is a limiter installed that can be released to bring out full physical ability.
- Big Wave Leg (ビッグウェイブレッグ Biggu U~eibu Reggu) - The left leg. A transfer device that is connected to seas and dams suck up seawater and supplies it to the Lobtailing Shoe.
- Lobtailing Shoe (ロブテイリングシューズ Robuteiringu Shūzu) - The left foot. Seawater supplied by the Big Wave Leg can be ejected vigorously to create a giant flowing water stream dubbed Big Wave (ビッグウェイブ Biggū~eibu). Any kicks that utilise the rushing force of Big Wave is tremendous, allowing the user to destroy the enemy with an impact comparable to a whale tail hitting the sea.
- Kamen Rider Build
- KujiraJet (Raising the Hazard Level ~7 Best Matches~:, Next Chapter Build Episode 22)
- Rider Kick: Build floods the area in front of him and shoots a torpedo before goes underwater, then a giant whale comes up and boost Build with its blowhole allowing Build to fly out of the water, and perform a jet-boosting Rider Kick at the enemy.