Jaxxon is a quick-witted creature known as a Lepi and is a smuggler from Coachelle Prime by profession. He teamed up with Han Solo and Chewbacca on a few occasions.
Jaxxon was a character that was created in the first couple of issues of the Star Wars comic series after Marvel was done with the official movie adaption. The character however looked very goofy and did not capture the imagination of the readers and was quickly left out of the story.
Years later, when Marvel re-acquired the rights to publish Star Wars, they made a goofy variant cover of issue 1 in which Jaxxon tries to get to the other Star Wars characters through a door, which the others manage to stop successfully by barricading the door. Jaxxon however knows the characters are there since he hears the loud breathing of Darth Vader.