Lisa Trevor/biology

 Lisa back.jpg|The eyeball on her back Lisa face.jpg|Lisa and her exposed skull  As aforementioned, Lisa's mutations have hideously deformed her physical build. Lisa's hideous face is partially masked by collections of flesh from her victims. During some cutscenes, one may be able to notice one of Lisa's uncanny eyes through a small hole in her mask. In Resident Evil, it is possible to see her teeth. Her oversized arms and hunchback give her an orangutan-like appearance. She is draped in a tattered hospital gown with her hands held together by a pair of wooden manacles lined with iron, which acts as a deterrent to Lisa's attacks. There is also an eyeball-like tumor visible on her back, a typical sign of the Golgotha Virus. Lisa can therefore deal considerable amounts of damage to her victims, and should not be confronted directly, as no weapon can truly stop her (though, if the player needs to get away and Lisa's in the way, a high powered weapon, such as a Magnum, will slow her down briefly, knocking her backwards allowing for escape. It should be noted though that she recovers quite quickly and the player should waste no time in retreating once she's knocked backwards). Numerous tentacles will emerge from her body and undulate violently when she is attacked, a sign of the NE-α Type used to create the Nemesis-T Type.

While in various parts of the mansion, one may hear the harrowing wails and cries of Lisa. This characteristic suggests that Lisa is incapable of using a higher level of thought and therefore conforms to a more animalistic nature. However, it should be noted that Lisa was able to start a fire in order to warm herself, as well as write a few crude entries in her journal. She also is able to croak "Mo...ther..." upon finding her mother's skull.

Abilities
Lisa was administered the "type-B" variation of the Progenitor virus. After that she served as a test subject for even more biological experiments. Lisa was able to survive all of their tests, regardless of the potency of the implanted virus or parasite. She was injected with a specimen of the NE-α Type in which, to the Umbrella researchers' surprise, Lisa not only overcame the specimen, but also managed to absorb it and adapt its powers into her system.

Lisa's main attacks include hurling herself towards her enemy and hitting them with her chain and shackles. However, Lisa's true power is near-immortality; she is able to take far more damage than any non-mutant human being and recover from it. Rumors among the researchers claim that she actually became fully immortal from experiments and even Albert Wesker doubted if it really was worthwhile fighting her. Despite her resilience, however, she was defeated by Wesker and died when Spencer's Mansion was destroyed.