Lieutenant Martine Sinclair is a NERO agent you only hear in recordings. Her voice turns up in several Inspector Field Notes and a mobile medical unit recording. Early in the outbreak she oversaw corpse disposal sites in the Highway 97 region.
After a run-in with the Militia, she and Russo hide in a medical unit at the Spruce Lake NERO Checkpoint and cut its power. Fed up with NERO, she talks about heading for Searose Beach, and Russo asks to come along.
Cooper
Cooper is a NERO researcher and a friend of O'Brian. His team goes into a cave in the Highway 97 region to sample a mutant Freaker and stops answering the radio. O'Brian sends Deacon in to find them.
Joany Gray
Joany Gray was Boozer's wife, his high school sweetheart and a friend of the Mongrels. She died in a crash years before the outbreak. Boozer still carries the loss, and she comes up often in his talks with Deacon.
Melinda Foster
Sergeant Melinda Foster is a Militia soldier from Wizard Island who runs supply and scouting missions for Colonel Garret. Marauders take her captive on Highway 97, and Deacon rescues her in Still Breathing.
Russo
Corporal Russo is a NERO operative heard in a recording from the Spruce Lake NERO Checkpoint in the Highway 97 region. He hides out with Martine Sinclair when the Militia hits the checkpoint.