Basshaa Form first appeared in Kamen Rider Kiva, the 2008 Japanese tokusatsu series from Toei. In the show, Wataru Kurenai transforms into Kiva and can adopt Basshaa Form to use the Basshaa Magnum and water-based attacks, drawing on the power of Ramon, the Basshaa. Clips of the henshin sounds later circulated among tokusatsu fans online, shared in transformation compilations and fan edits long after the series ended. Its length and clear build make it more recognisable than a generic power-up effect, so Kiva fans still reach for this specific form change.