Heavy breathing and coughing if you are sick. Sniffiling.
Bandits either screaming, charging, begging for their lives, etc...
I could help with this.
Some sounds to inform about character state seem like a good idea. NPCs making sounds, however, would get repetitive very fast I think, becoming more annoying then immersing.
I think there should be sounds in fights to indicate who was hit.
Ran around with a clown mask before it was cool