Mouse appears to be the youngest and most diminutive crewmember on the Zion hovercraft Nebuchadnezzar. He is a pod-born zionite and is later killed by S.W.A.T. gunfire within the Matrix.
First Appearance
Mouse turns up smiling anxiously behind Neo during his introductory tour of the Neb. Neo does not notice Mouse until Morpheus points him out.
Role on the Neb Crew
Mouse shows a quirky philosophical streak during the mealtime scene. He uses a product called Tastee Wheat as an example of how the Machines may have botched sensory perception, i.e. the taste of the simulated food may be inaccurate. He also suggests, apparently in all seriousness, that this could be the reason many foodstuffs are said to taste like chicken.
Both his hedonism and his pride in his work as a programmer are reflected by his affinity for the Woman in Red (a component of the Agent training program) for whom he claims design credit. He is fond of ogling her poster while on watch duty and urges Neo to meet her a second time. The implicit attempt to arrange a sexual encounter between her and Neo earns him the honorific "the digital pimp" from Switch.
Mouse's Last Stand
Mouse is awaiting the return of his shipmates in the Lafayette Hotel when Agents change the hotel's configuration. Following a warning by phone from Tank, he desperately makes for a passageway and finds it's been transformed into a brick wall.
As S.W.A.T. forces move in to corner him, Mouse scrambles for a large case he's had standing by and produces his favorite guns. Though trapped and doomed, he goes down shooting and shouting a battle-cry.
Aboard the Nebuchadnezzar, Mouse spits some blood as he dies. Trinity later covers his body in a crude shroud and lays him alongside Apoc, Dozer, and Switch.
Appearances
Mouse supplies comic relief throughout the film, making jokes about the ship's food and calling Apoc and Switch hypocrites. He also has a disregard for fashion, wearing a rib cage t-shirt underneath his Avatar's outfit. Like Morpheus and Neo, he wears a hat on the ship.