That's Kokoron-chan, a Japanese mascot to inspire people to donate blood. Leave it to the Japanese to spice up a blood donation drive with a cute (and bloodthirsty) mascot that looks a lot like the Kool-Aid Man.
Pink Tentacle has more of Japan's blood mascots: Link
http://japansugoi.com/wordpress/yui-ichikawa-and-nana-eikura-in-japanese-red-cross-commercial/
Shame some killjoy would probably stop them doing it now.