Kivat Bat the 4th is a key supporting character in the tokusatsu series Kamen Rider Kiva. As a small, bat-like creature, he serves as the transformation device and partner for the main protagonist, Wataru Kurenai, enabling him to become Kamen Rider Kiva. Kivat is characterized by his energetic personality, witty remarks, and his loyalty to Wataru. Despite his small size, he plays a crucial role in battles, offering advice and sometimes comic relief, while also acting as a bridge between the human and Fangire worlds.