It is a plug-in that embed wapuu drawn by CSS in the short code.

Character of wapuu will come falling as snow on the screeen.

Ja.wordpress.org official character "わぷー(Wapuu)" will tell you about your activity on a dashboard.

Gamify Your WordPress Experience with Customizable Wapuu Notifications & Rewards

Wapuu Dashboard Pet is a virtual pet for your WordPress admin dashboard. The more you fail to update your site, the sicker Wapuu becomes. Keep WordPress Core, plugins and themes up to date to keep them happy.