|This article is about a/an ally in Kamen Rider Decade.|
Basshaa (バッシャー Basshā) of the Merman Race (マーマン族 Māman Zoku) was one of the Arms Monsters, the servants of Kiva, each the last of his kind. They support Kiva by turning into the weapons that allow Kiva to change form. They were absorbed into Beetle Fangire's breast plate and shoulder armor when they question their new king's intentions of removing the human/Fangire coexistence law.
- Height: 170 cm
- Weight: 68 kg
- "Basshaa Magnum!"
- ―Kivat's transformation announcement[src]
- "Basshaa Bite!"
- ―Kivat's finisher announcement[src]
The Demon Sea Gun Basshaa Magnum (魔海銃バッシャーマグナム Makaijū Basshā Magunamu) is a gun-like weapon that Basshaa assumes for Kiva to change into Basshaa Form. The Basshaa Magnum's turbine spins to generate bullets made of high pressure water. The finishing attack is Basshaa Aqua Tornado (バッシャー・アクアトルネード Basshā Akua Torunēdo). This is done by first having Kivat perform a Basshaa Bite (バッシャーバイト Basshā Baito) on the hammer of the Basshaa Magnum. From there, the gun's turbines spin, surrounding Kiva with water as the weapon creates a pressurized ball of water that can home on to enemies upon firing, leaving the Fangire in an extremely fragile state where even the slightest touch can shatter them. 
Behind the scenes
- ↑ "TV Asahi's page for the Basshaa Magnum". http://www.tv-asahi.co.jp/kiva/rider/basshaamagnum.html. Retrieved 2009-06-27.