Too Dumb to Live: Or, more accurately, he's too dumb for those around him to live.
He does grow out of it as things become serious.
Took a Level in Badass: 9's role in the first action scene is to watch from a can as 2 fights off the cat creature. From there, he steadily gains courage (but not much combat ability). At the end of the film, he runs right up to the machine, sticks the soul-draining device right in its face and takes back his friends' souls while destroying the Machine for good.
The largest of the Stitchpunks, 8 is the muscle of the group, yet lacks intelligence and remains faithful to 1 not only as his bodyguard but also his only friend. He follows 1's orders loyally and often bullies the other Stitchpunks. However, what 8 lacks in brains, he more than makes up in sheer brawn and is quite strong and daring, wielding a large sword made from a butcher's knife, as well as half of a pair of scissors and a magnet which he uses for... questionable reasons.
Anti-Hero: 8 is on the good guys' side, but his questionable loyalty to 1 and tendency to Kick the Dog put him squarely in this territory.
Badass: When faced with a large flying monster coming straight at him, he grunts, puts on his visor and throws his sword at it.
BFS: By 6-inch-tall doll standards, anyway: a meat cleaver and half a pair of scissors.
The Big Guy: Standing taller than any other Stitchpunk, 8 is also their designated combat specialist, carrying the heaviest weapons in the group. Also does the heavy lifting.
Cool Helmet: He puts a makeshift faceguard on for about 5 seconds during the fight with the Winged Beast.
Cool Sword: TWO. A blade attached to a sewing needle and a SCISSOR BLADE.
Died Happily Ever After: During the funeral scene at the end. He gives off a huge friendly grin before dissipating.
The only female Stitchpunk, 7 is an independent and strong-hearted warrior. She left the Sanctuary to hunt down the Cat-Beast and discover the truth of the barren world, something which 1 did not agree with and two have been at odds ever since. Spending a vast amount of time in the wasteland allowed 7 to teach herself how to fight and survive, sporting a crow's skull for a helmet and using a spiked staff and other weapons to fight.
The oddball of the group, 6 is in his own world most of the time, painting seemingly obscure drawings which are actually of the talisman used in the film to bring the characters to life. He is actually an oracle figure, having prophetic visions which he expresses in his drawings; 9 is the only Stitchpunk to believe them, although 2 and 5 express interest. 6 has a unique appearance with uneven eyes, wild hair and fingers made from the nubs of ink pens. Because of his weird appearance and attitude, he is often avoided and ignored.
The "middle man" of the group, 5 is a kind-hearted but fearful engineer, healer, and 2's assistant. Shortly after his awakening in the world, 5 was wounded in the war and lost his left eye, and was fixed up by 2 to sport an eyepatch of sorts. He acts as the watchtower guard in Sanctuary as well as the healer and peacemaker. He has strong friendships with most of the Stitchpunks, particularly with 2, 7, and 9.
Break the Cutie: Losing an eye, losing his mentor and coming close several times to losing his life causes 5 to appear glum most of the time.
Friendly Sniper: Extremely friendly and kind, but uses a crossbow to snipe at a few monsters. It only works against the Seamstress, though. Also, the way he found 9 was looking at the wasteland through a sniper reticle.
My Master, Right or Wrong: Initially he defaults to 1's leadership since "A group must have a leader." After a sharp reminder from 9, he decides to go with him, and eventually stops listening to 1 altogether.
No Sense of Personal Space: It's the 9 drinking game! Take a drink every time 5 clings to 9! You'll die of alcohol poisoning by the end of the film.
Team Mom: The DVD commentary refers to him as the 'group mom'.
3 and 4
"To Define Us" and "To Teach Us"
Mute identical twins, 3 and 4 left with 7 to learn the reason why the world is barren. Moving into an abandoned library, the two catalogued and analysed everything they found and formed an understanding of the city's history. They do not speak but rather communicate via their eyes and physical movements. They have the ability to project images and video clips from their eyes. They don't seem very comfortable outdoors.
Ambiguous Gender: While the Russian dub of the film explicitly states that 3 and 4 contain the souls of The Scientist's twin sons, Word of God states that their sex (if they have any sex at all, that is...) is up to interpretation.
Creepy Twins: Mostly because everything in this setting is creepy.
Cute Bookworms: Unfortunately they don't get to read much in the movie.
Cute Mutes: They don't speak with their mouths; it's possible they use a form of morse code to communicate with each other.
A frail inventor, 2 is a curious and adventurous person and is seemingly fearless. 1 deliberately sent him out into the wasteland to die, believing him to be a threat to the safety of Sanctuary. He is kind, caring, generous and uses the world's scattered remains to build inventions. He is close friends with 5.
Blade on a Stick: He has a makeshift spear as a weapon, which he uses during his fight with the cat creature.
Mentor Occupational Hazard: He doesn't get much screentime, but he's still the first person 9 meets, and the one who fixes his voicebox. It's shown that he played this role to 5 as well.
Mr. Fixit: His apparent raison d'etre, as each of the 9 had a role to play designated by the Scientist.
Nice Hat: Really. And yes, that's a candle and a glasses lens fixed onto it.
Sacrificial Lamb: He's nice to 9, then gets grabbed by the Cat Beast, eventually gets rescued by 5, 7, and 9, and then immediately gets killed by Mr. Fab. He's the first of the Stitchpunks to be killed, too.
The Smart Guy: Above and beyond the most intelligent of the Stitchpunks.
The leader of the Stitchpunks, 1 is a dogmatic and cowardly person, but asserts his authority over the others and likes to subjugate them. However, he also does want what is best for them — most of the time. He wears a hat, cloak, and wields a staff to separate himself from the others. 1 follows the belief that "sometimes one must be sacrificed for the good of many", which leads to clashes with other Stitchpunks, like 7 and 9.
Anti-Hero: 1 isn't a villain by any stretch, but calling him a straight up hero would gloss over his obnoxious personality and somewhat questionable leadership decisions.
Break the Haughty: On three occasions: a) when his cathedral burns down; b) when 8 goes missing; and c) when 2 gets a mock funeral service. In each case, his normally dour visage cracks.
Dirty Coward: Not that he's entirely unjustified, but still...
Famous Last Words: "They left us nothing. Nothing. Why do we have to right their wrongs? Sometimes one must be sacrificed."
Taking the Bullet: He lets his soul be absorbed by the Machine to give 9 the opening to destroy it once and for all.
Ungrateful Bastard: In response to 9 saving his life by telling him to let go of his cape, he scoffs and tells his savior he owes him a new cape.
Well-Intentioned Extremist: He believes in the precept of sacrificing a single person for the good of many others. And as his death shows, he holds himself to the same standard as the rest of the group.
Voiced by Alan Oppenheimer
The creator of the Stitchpunks and the Fabrication Machine, and the one who started everything. The Scientist constructed the machine to improve the technology of the world, only for the Chancellor's Chronic Backstabbing Disorder to use the machine to build other machines to wage war on other countries. The machines are corrupted and wipe out life on Earth. The Scientist quickly becomes The Atoner and builds the Stitchpunks to bring life back to the world.
The Atoner: He feels like everything is his fault for creating the Fabrication Machine, which is why he created the nine Stitchpunks to bring life back to the world when all the humans were gone.
Casting Gag: The reason Oppenheimer was cast was because he was related to Robert Oppenheimer, the Father of the Atomic Bomb, and similarly showed regret for creating this destructive force when others used it for... less than savory purposes.
Heroic Sacrifice: The Scientist intentionally gives his life and soul to bring the Stitchpunks to life.
Video Wills: The Scientist leaves a video message for 9 instructing him how to kill the machine.
Eye Scream: An early draft of the film's story featured a scuffle between the Scientist and the Chancellor in the beginning of the film, ending with both dead and the Chancellor with an inked quill stabbed into his eye.
No Celebrities Were Harmed: The Chancellor does not physically resemble Hitler, but the similarities are readily apparent without a shared appearance.
The Fabrication Machine/The B.R.A.I.N
A.I. Is a Crapshoot: Zigzagged. The Scientist claims the machine was flawed and dangerous because it had genius intellect and reasoning, but it had no soul and thus was up to corruption or reprogramming by its master, rather than acting based on a moral compass. Despite this, we see the machine fighting to defend its creator from the Chancellor's cronies, and it is driven to anger by the destruction of its creations.
Expy: Of GLaDOS. Firstly, its appearance to GLaDOS is uncanny; it first moves around by swiveling on a giant arm that is attached above and the glowing eye in a sphere is exactly like a more steampunk version of a GLaDOS personality core. Second, it 'attacks' with drones and machines, particularly gun-drones with machineguns, and finally it uses a deadly gas toxin (possibly a nerve gas) for an area of effect attack.
Gadgeteer Genius: It makes robots fast without a lot of materials. It also seems to be good at programming AI.
Genius Bruiser: ...and it has enough strength to knock over an artillery cannon with little effort. Before it was "upgraded", it broke someone's neck with one claw.
Body Horror: She has the corpse of 2 sewed onto her tail. To make things worse, when she sews up stitchpunks to subdue them, she's pulling those threads through their bodies.
Evil Genius: To a point. The Fabrication Machine's creations get progressively more intelligent as it continues to design, with the Cat Beast being the most primal and animal-like and the Seamstress being the most cunning.