It was Tetsujin, the star of the hugely popular Tetsujin 28-go manga series, in a great looking golden version (a small 1:10 scale model made of gold was also displayed), present there as part of the NTT Docomo advertising campaign to broadband data connection.
As usual on events like this, lots of people taking photos and friendly members of the staff, explaining the details...
P.S. The glass skyscraper in the back is the spectacular Umeda Sky Building:
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 22mm
Aperture: F/6.3
Shutter Speed: 1/320s
ISO Sensitivity: ISO 200