Kivat Bat the Third is a key character in the Japanese tokusatsu series 'Kamen Rider Kiva.' He is a small, intelligent, and talkative bat-like creature who serves as the transformation device for the protagonist, Wataru Kurenai. Kivat bites Wataru, enabling him to transform into Kamen Rider Kiva and fight against the monstrous Fangire. Charismatic and witty, Kivat provides both comic relief and vital support, acting as a mentor and partner to his human companion throughout the series.