Though few specifics are revealed about her previous life inside the Matrix, it is told that she cracked a database so secure that she is famous among hackers, and that Morpheus, one of a number of real-world hovercraft commanders, initially identified her and helped her escape from the program.

At the beginning of the series, she is first mate on Morpheus' Nebuchadnezzar and serves mainly as a go-between for him and the individuals he wishes to free from the Matrix.

Eventually, she and the rest of the Nebuchadnezzar's crew unplug Neo from the Matrix and begin his training as a new recruit in the war against the machines.

In The Matrix Reloaded, the second film in the series, Trinity aids in the rescue of the Keymaker from the Merovingian and in the subsequent escape.

At the same time, Neo is given a choice by the Architect between reaching the Source and preserving humanity, or returning to the Matrix to save Trinity.

He chooses to save Trinity, interfacing with the computer code of her virtual self to extract the bullet and restart her heart.

She dies in Neo's arms, and he negotiates a truce with the Machines to enter the Matrix and wipe out the Agent Smith infection.

In the video game Enter the Matrix, Trinity appears in a scene where she faces off against Ghost in a practice spar, the two subsequently discussing their shared belief that Neo can defeat the Machines.

Over the course of the game, it is heavily implied, although never expressly stated, that Ghost is in love with Trinity, but that she regards him as a brother for their having been freed from the Matrix at or near the same time.

Her role in The Matrix: Path of Neo is relatively similar to her appearances with Neo in the films; she has a spar with him during his sword-fighting training, accompanies him during the raid on the military building to rescue Morpheus (subsequently helping him to defeat an Agent on the rooftop), and is later rescued by him from some attacking Agents after the last meeting with the assorted ship captains.

Without a physical form, Trinity takes the appearance of a floating figure made of golden code when within The Matrix.

Initially distraught with her condition, she eventually finds solace in the fact her existence is the key to finally rebooting the Matrix and erasing Oligarch override control once and for all.

They include: Jennifer Connelly, Jada Pinkett-Smith, Janet Jackson, Marisa Tomei, Demi Moore, Ashley Judd, Salma Hayek, Angelina Jolie, Michelle Yeoh, Jennifer Lopez, Catherine Zeta-Jones, Drew Barrymore, Gabrielle Union, Kate Hudson, Uma Thurman, Jennifer Beals, Mariska Hargitay, Lucy Liu, Courteney Cox, Angie Harmon, Ming-Na Wen, Elizabeth Hurley, Sandra Bullock, Gillian Anderson, Heather Graham, Rosie Perez, Winona Ryder as well as Madonna who has revealed that she had turned the role down and has admitted regretting that decision.

When she cracks the IRS database before her release from the Matrix, she chooses the hacker handle "Trinity" to imply that she is as enigmatic as the concept of a "Three-In-One Being".

In The Matrix Resurrections, Trinity develops the same reality warping powers as Neo after being reawakened to her true identity.

By touching hands, Neo and Trinity can let out a powerful telekinetic shockwave and she is later able to manipulate the appearance of the Analyst with just snaps of her fingers.