9 Concept art: Character Texture-4

Description/Appearance

3 & 4 are smart yet curious, very cute and adorable twin stitchpunks. They are made out of blue and yellow striped, garden gloves; the glove sleeves as their hoods, the wires and stitches bounded on their arms and legs to keep their body together, and their capes are made out of empty thumb slots. They cannot talk but they use a flickering light system in their eyes to communicate to each other. They normally communicate with others through hand motions, though, when elaborate explanations are needed, they use film projectors to literally project their thoughts onto a screen. They instinctively run and hide at the sight of danger, due to the fact that they are weaponless and don't know how to fight. 3's number is shown on the front, on the left side; 4's number is also on the front, on the right. If they are projecting thoughs for a long period of time, they feel faint, only shown as 4 shows 9 why the machine is after them. This could also be because of the danger they regret to see.

Their genders, however, remain a mystery. Because they can't talk, no one knows if they're girls. However, Shane Acker let the Twins' genders open for everyone to guess. However it can be argued due to the fact that Tim Burton said that 7 was the only girl which could possibly mean that 3 & 4 are both male. However, all of the stitchpunks are technically genderless because they are machine-based beings, and their gender is only identifiable through their personality and voice boxes. It is assumed that 3 and 4 are genderless, or their gender is open to interpretation, similarly to the "SEGA" video game character NiGHTs, who has a masculine body but a female voice. 

Trivia

• After the events of the film, 9 would probably be their "father", 7 being their "mother", although it's still unconfirmed for this fact.
• They seem to retain some childish behavior. They like playing, and they can be seen frequently squabbling over things, like 9's lightbulb.
• It is possible that because of their survival they will have key roles in a future film.
• 3 and 4 both use flashing lights to communicate, but flashing lights stun and distract stitchpunks. Such as the lifeless 2 on the tail of the Seamstress. 9 was seen getting a bit distracted by 3 and 4's flashing lights.
• According to Shane Acker, the twin's body language (i.e. quick, twitchy movements, clambering over each other, moving low to the ground with hunched shoulders, etc.) was inspired by meerkats.