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The title character. WALL•E is the only robot of his kind shown to be still functioning on Earth. Although working diligently to fulfill his directive to clean up the garbage, he is distracted by his curiosity, collecting trinkets of interest. One day during work, he meets EVE and his life changes forever.
Voiced by: Ben Burtt
Absurdly Dedicated Worker: He keeps trying to clean up Earth's surface after all humans have left even though he is the only robot still functioning and no real progress has been made in several hundred years.
Adorkable: He loves musicals (well, one musical) and collects sporks.
All-Loving Hero: Seems genuinely pleased to meet everyone he comes across, human or robot.
Badass Adorable: Especially in the climax when he holds up the holo-detector despite being damaged by Auto's taser.
Blithe Spirit: Everyone he encounters starts thinking differently as a result of it—maybe because he wakes them up from their trance or because he's so filthy they break their programming to clean him.
Butt Monkey: Gets blasted at, crashed into, broken, and tossed into walls regularly.
Critical Annoyance: A low-pitched BEEP BEEP BEEP BEEP plays when he's about to run out of energy.
Determinator: Did the same job for 700 years, held onto the ship back to the Axiom for no one knows how long simply because EVE was on it, and held up the holo detector even though he had very recently been electrocuted by AUTO and was still recovering from that.
Last of His Kind: All the other WALL•E units have shut down. (He scavenges them for replacement parts.)
Leitmotif: "Put On Your Sunday Clothes" from Hello, Dolly! serves as a symbol of WALL•E's emergent personality, and later becomes the rallying anthem of the malfunctioning robots. The absence of this song on WALL•E's personal audio recorder is what convinces EVE that he Came Back Wrong.
Love at First Sight: He falls in love with EVE the first time he sees her. Possibly justified in that EVE is the first living thing he's seen other than cockroaches.
A sleek robot who WALL•E meets during a day at work and has come to Earth looking for something. She moves using antigravity technology and is equipped with scanners, specimen storage and a plasma cannon in her arm, which she is quick to use. WALL•E falls in love with her the moment he sees her. Eventually, she warms up to him and falls in love with him as well.
Voiced by: Elissa Knight
Action Girl: With her arm cannon and a general willingness to rush into a fight.
Action Girlfriend: To WALL•E eventually. She defends him, carries him around, and rescues him when AUTO's minions start chasing them through the ship.
Adam and/or Eve: The first robot WALL•E encounters after living alone for so long, and she is meant to find life and get humanity back to Earth.
Arm Cannon: Her primary weapon. Also her main tool, it seems.
A tiny, obsessive-compulsive maintenance robot with rollers for hands who keeps Axiom clean. When M-O meets WALL•E and sees how filthy he is, he deviates from his normal routine and follows WALL•E, cleaning up behind him.
Voiced by: Ben Burtt
Butt Monkey: He's dedicated to his job...no matter how much he's going to need repairs by the end of it...
Inspector Javert: Come hell or high water, he will ensure the grungy trash compactor will not disrupt the sterile, germ-free environment of the Axiom. A benign example, as he's perfectly friendly to WALL•E once he does his job.
The Napoleon: Smaller than most of the other robots, but leads the group of cleaner robot.
Neat Freak: So much so that he breaks his programming to follow WALL•E throughout the ship and clean him.
Super OCD: He does not tolerate dirt and would even cut through the other robots' designated paths to clean up WALL•E's tracks.
When All You Have Is a Hammer: Even when M-O starts helping the heroes, he does this by cleaning, the only thing he can do, even when other things would be more useful.
AUTO is the autopilot. Shaped like a sailing ship's steering wheel, Auto units assist the ship's captain with his or her duties.
A.I. Is a Crapshoot: Inverted; the other robots are going beyond their programming while Auto is still following his directive.
Anti-Mutiny: He is actually following his instructions by defying the Captain.
Big Bad: The reason why the Axiom hasn't returned to Earth for all of these years is because of Auto's directive.
Completely Missing the Point: See A.I. Is a Crapshoot. CEO Shelby Forthright gave the order not to return to earth because it couldn't sustain life. The current Captain points out that that order no longer applies since the plant proves that earth can now sustain life. AUTO's response? "Irrelevant." AUTO was given the order not to return to earth, and will stay by that order even though the reason it was given has changed.
The Computer Is Your Friend: He was given orders to safeguard humanity, and he will fulfill those orders whether the humans want him to or not.
Villainous Breakdown: Starts when EVE and WALL•E break out of the trash pit. Exacerbated by Captain when he fakes out Auto with the plant backdrop. "Not possible" he says in monotone. Gets even worse when he starts sending significant numbers of Steward bots after EVE and WALL•E. Jumps off the slippery slope when he intentionally causes the Axiom to list, sending everyone tumbling about. Climaxes when he's using his taser to jam down the Holo-Detector retract button with excessive force.
Walking Spoiler: He is first built up as just an auto pilot before A.I. Is a Crapshoot happens. Then he subverts it when he reveals that he has been following orders the whole time.