Olivia has lightly tanned skin, brown hair, and brown eyes. She wears a doctor's coat over a black top. Overall, she looks almost identical to Estela. The only physical differences being Olivia has shorter hair and doesn't have a scar over her eye, her skin tone is also slightly darker than Estela's.
Olivia was a loving mother and dedicated scientist who wanted to make the world a better place. After she discovered Everett Rourke was a criminal, she attempted to expose him to the world.
Before her death, she created a Virtual Reality simulation meant to show the destructive capabilities of a Rourke International project code-named the Omega Specimen (The Endless). After the simulation, she urges the wearer of the VR Headset to contact their government officials and warn them of the impending crisis, showing she was dedicated to justice.
Estela is Olivia's daughter. They were very close. Estela was originally hellbent on murdering Rourke (and later Lila) to avenge her death, but came to terms with the fact that her mother didn't want that life for her.
Olivia originally enjoyed working for Rourke and believed that he would benefit the world. She later discovered his crimes and attempted to expose him to the world. In Book 3, Chapter 11 he is revealed to be Estela's father. It is implied, however, that Olivia did not fully love him.
Lila was a good friend of Olivia but her loyalties were to Rourke. She reluctantly killed Olivia on his orders.
Nicolas was Olivia's brother. They arranged for Estela to be cared for by Nicolas while Olivia was working on La Huerta, an arrangement which continued following Olivia's death.