Number-kun has a very striking, very simple design. He has cute eyelashes, a warm smile, and a rectangular body. The numbers on his top right, 123, are the first three letters of a post code! He has arms, one of which always points to the post code, but his legs are optional.
His sharp nose and cute cap are very distinctly T-shaped. They are actually comprised of the character 〒, the Japanese postal mark. This character represents the postal service in Japan.
The postal mark can either be coloured in red or the design can be left monochrome. Either way, he is dashing!