Harlow Jordan is a survivor upon Palanai who lends the player aid upon their washing ashore. She is part of your team until the Cinema is reached within Henderson. Her disappearance is rather obscure: Chichimona exclaims that the Immune allowed Harlow to be left behind, when in fact Harlow was with those who were not immune. Later on she is called a terrorist by Serpo, the man who originally had the player(s)/Hero(es) arrested, detained, and tested on because of their apparent immunity. It is, of course, possible the claims about Harlow are false, given that he has lied several times throughout the story.
Harlow's dying words—assuming she has truly died—were that the Heroes themselves would be angels of death.
Interestingly, her veins pulsate in almost the same fashion as the Grenadier's exposed body, though to a much lower physical degree of distortion.