The best work is a character proposal produced by the group "mountain mountain" represented by designer and picture book writer Kohei Yamashita. The character proposal was born from the idea of "Can the logo mark be used as a character?" It was designed with the concept of being able to change its appearance by combining the logo mark with the water of Osaka,
which is called the "city of water". There is no fixed shape T-Shirt Design for the character, the main design is just one shape, the red part is divided and the blue part is an image that can change the shape freely. This work is a character proposal selected from all 1,898 works, and three final candidate works selected through each selection process were announced on March 2. As many as 40,704 opinions were gathered in the solicitation of opinions on the final candidate works,
which was held from March 2nd to March 10th. The final selection committee made a selection based on the opinions received, and the best work was selected. In the opinion solicitation, more than 60% of the respondents said that this work had an impact, had humor, was interesting, and was new and never seen before. In the future, this character will be widely used as another symbol of the Osaka / Kansai Expo, following the official logo mark decided in August 2020, to further publicize the Osaka / Kansai Expo and foster momentum.