Claxon is a robot outlaw.
In The Great Thrilling Adventure Hour / Welcome to Night Vale Crossover, Felton overhears Claxon planning a robbery along with Highwayman Dan and Samuel Bolt. In a confrontation with Sparks Nevada and Croach the Tracker, Bolt's hands are shot off.
Later in the episode, when Croach the Tracker is in Night Vale, he discovers that Claxon and Bolt have formed a civic committee to destroy the moon. While the Claxon who is on Mars has not yet time-traveled, he is able to steal a time-shifter from Cecil Baldwin and travel back in time to Night Vale in order to set up the very committee Croach had attempted to prevent. Eventually Dolores County is able to destroy the time-shifter and stop them from constantly changing history with it. Instead, she returns to the moment Claxon and Bolt were first arriving and shoots them to prevent the entire plot from occurring.
Later, in Marshal on Mars, Claxon shows up on Mars during Sparks and Ginny's rehearsal dinner as part of Techs's congregation.