Kumakyuu is Yuna's summoned Beast along with Kumayuru. Kumakyuu takes the appearance of a White Bear. In its normal adult form, it is as big as a large bear, but it can also change its size to be more compact in its cub form. Whether big or small, Kumakyuu looks like a cute teddy bear.

(Source: Kuma Kuma Kuma Bear Wiki)