After being administered by Hazard Trigger, he is now Castle Hazard Smash. Akaba is a delinquent right down to his appearance and personality. He is cruel and careless, not hesitating to attack a civilian population out of boredom. Akaba sees himself as superior to his comrades, barring his Captain, who he deeply respect. Akaba, not unlike the rest of his team, is very petty and immature, even arguing over who would take Sento and Ryuga's Fullbottles after defeating them. He and his team were called idiots by Ryuga within minutes of meeting him.
Publication Information
- Build : Masaru Ooyama
- Japanese : 大山勝
- Version : Kamen Rider Build
- Type : Akaba
- Affiliation : Hokuto Three Crows
- Gender : Male
- Origin : Earth (World Of Build)
- Season : Kamen Rider Build
- First Appeareance : Kamen Rider Build Episode 16 : The Weaponry Hero
- Last Appeareance :
- Number of Appeareance :
- Potrayer : Eishin
- Main View : Full Episodes
Despite his negative traits, he and his fellow teammates all wanted to protect their families back in Hokuto. He also feel frustrated since he can't help his Captain much during the war. In the end, he, along with Aoba and Kiba, took Stalk's offer to strengthen them into Hazard Smashes, knowing that it could cost him his life. Aoba's death at the hands of Build using the Hazard Trigger made Akaba very bitter and violent towards Sento and Ryuga.
When Hokuto Prime Minister Yoshiko Tajimi declared war on Touto, Akaba was part of the advance guard with Aoba and Kiba. Through his power as a Smash, Akaba launched a premature strike at the city. Disregarding Kiba's warning against disobeying the boss, Akaba called out to their superior who was engaged elsewhere, asking if he was finished. The Weaponry Hero
Akaba and the others later tracked down Sento Kiryu and Ryuga Banjou, and transformed into their Hard Smash forms. After successfully knocking them out of their transformations, Akaba demanded that they hand over their Fullbottles, prompting Aoba and Kiba to argue with him over who should get said Fullbottles. By the time they had pulled themselves together, Sento and Ryuga had absconded.
Later, they found Sento consoling Misora Isurugi as she lamented her role in allowing evil to wage war, and told Sento to hand over his Fullbottles. This time, Sento gave them a challenge with a determination he gained from Misora, using RabbitTank Sparkling Form. However, Akaba, Aoba, and Kiba still quickly gained the upper hand, until Ryuga appeared with the Sclash Driver and transformed into Kamen Rider Cross-Z Charge. Ryuga and Sento easily defeated them, causing them to drop the Phoenix, Robot, Wolf, Smapho, Kuma, and Televi Fullbottles. Kazumi Sawatari arrived shortly after to challenge Sento and Ryuga.
Form
Castle Hard Smash
- Castle Hard Smash
- Origin : Earth (Hokuto)
- Version : Kamen Rider Build Series
- Type : Smash
- Alter Ego : Akaba
- Height : 215.3 cm
- Weight : 150.8 kg
- Appearances : Build Episodes 16-19
- Akaba's transformation into the Castle Hard Smash by injecting the Castle Fullbottle into his arm
Castle Fullbottle
- Castle Fullbottle
- Used by Akaba to transform into the Castle Hard Smash/Castle Hazard Smash.
- The Castle Hard Smash possesses super strength, capable of delivering powerful punches.
- The Castle Hard Smash's Ground Rampart shoulder-mounted shields are capable of great defensive utility or ramming ability.
- The Castle Hard Smash can fire a green energy beam from the Catapulta Cannon on its forehead.
- Castle Hazard Smash
- Origin : Earth (Hokuto)
- Version : Kamen Rider Build
- Type : Smash
- Alter Ego : Akaba
- Height : 215.3 cm
- Weight : 150.8 kg
- Appearances : Build Episodes 16-19
- After being administered with the Hazard Trigger's energy, Akaba can now transform into the Castle Hazard Smash with the Castle Fullbottle
Castle Fullbottle
- Castle Fullbottle
- Used by Akaba to transform into the Castle Hazard Smash.
- The Castle Hazard Smash possesses super strength, capable of delivering powerful punches.
- The Castle Hazard Smash's Ground Rampart shoulder-mounted shields are capable of great defensive utility or ramming ability.
- The Castle Hazard Smash can fire a green energy beam from the Catapulta Cannon on its forehead.
- The Castle Hazard Smash can launch red energy bolts from its arms.
- Imitation Akaba / Castle Lost Smash
- Origin : Earth (Hokuto)
- Version : Kamen Rider Build
- Type : Clone
- Created by : Evolto
- Height : 215.3 cm
- Weight : 150.8 kg
- Appearances : Build Episodes 46
- This mimicry of Akaba was created by Evolto using his own DNA in his quest to defeat Kamen Rider Grease and defend Pandora Tower.
Castle Fullbottle
- Castle Lost Fullbottle
- Used by Imitation Akaba to transform into the Castle Lost Smash.
