Gray Walker is the partner of Dale Boyd, after Roy captures Dale he went out and tried to get revenge. He is indirectly stopped by Solty before he can kill Roy. Later he frees Dale while he was being transported to another facility, the two then steal an Armored Transport from R.U.C. Security. Together they go after an injured Roy and chase him into a park. Solty intervenes and damages their AT shortly after she throws them high into the air where they are destroyed by the Aurora Shell