She is the captain and pilot of a Zion hovercraft, the Logos, the smallest (and therefore most maneuverable) ship in the human fleet with a crew of only three: herself, weapons expert and First Mate Ghost, and Operator Sparks.
She is also a skilled driver as seen in The Matrix Reloaded, when she swiftly navigates a crowded network of freeways in order to save Morpheus from falling to his death off the top of a truck trailer.
In one scene during The Matrix Revolutions, she maneuvered the rather massive hovercraft Hammer through the narrow, cluttered passage of a mechanical line (while under heavy attack and pursuit by Sentinels), a feat no other pilot has successfully performed.
At the end of The Matrix Revolutions, as the retreating Machine army obliged the new peace bartered by Neo, Niobe is seen embracing Morpheus, perhaps an indication of a renewal of their romance.
Although not explicitly stated in Matrix Resurrections it is implied that Niobe is now in a domestic partnership with Io’s plant expert, Freya.
[3] In Chapter 5.1 of The Matrix Online, Niobe had a meeting with fellow Zion operatives inside Bishop Imports in the International District to test out a set of chemicals that were upgrades meant for the Agent programs.
On the Recursion instance, Ghost leads a rescue team to Bishop Imports in Ueno, while the Effectuator (a program hired by the Merovingian who controls his constructs), and other redpills protect the hardline systems to facilitate the operation.
Other minor roles include briefing and de-briefing Zion operatives during missions, and rewarding Redpills with special items.