Cosmoe

Cosmoe originated as a advertisement character that you could customize by getting his costume and sword from the galactic hot dog cart.

Cosmoe Now
Cosmoe is believed to be involved in something much more poptropica now, the Galactic Hot Dogs cart has been around longer then most ads, and Cosmoe is the first advertisement to appear in a common room. Cosmoe is also friendable by the username of NPC:cosmoe (discovered by raqk).

His island
Cosmoe mainly appears in the Lunar Colony Island in poptropica.