Mashin Eiyuuden Wataru
Spirit Hero Wataru
Keith Courage
Adrien le sauveur du monde
魔神英雄伝ワタル
A 9-year-old boy named Wataru Ikusabe is magically transported to a magical realm of the gods called Soukaizan which he is supposed to save. In his quest to save the realm, he manages to transform a clay sculpture into a somewhat autonomous (small) Super Robot.
(Source: Wikipedia)