Metal Form: Jack-Jack is able to convert his body into heavy metal, giving him a much greater weight and density.So far he has displayed the following abilities: Polymorphing: More than simply shape-shifting, Jack-Jack can manipulate his physical properties to achieve a variety of effects.His powers and abilities are significant enough for his siblings to use him as a third member of a rescue team. Mozart's music will trigger Jack-Jack into manifesting his powers, which Edna Mode uses to design a new suit that has sensors and a hand-held monitor, which alerts his family to upcoming use of his powers and allows them to counter them quickly. When he transforms into a little monster, Jack-Jack's skin turns red and gains sharp fangs and claws, that he can use to defend himself and look intimidating. Although he is usually seen in a yellow onesie during his on-screen appearances in the film, he also has a red super suit with a black mask. He also has two baby teeth on the bottom of his mouth. He has a single tuft of strawberry-blonde hair on his head and blue eyes. Jack-Jack is small, albeit at the average size for a baby as he stands 2'6'. Jack-Jack even recognized that the hypno mask Elastigirl was wearing made her evil, causing him to release her by removing it. He was, in fact, the one who made his father accidentally kill Syndrome. He is smart and intuitive for an infant as he recognized Syndrome as an enemy and identified the exploding plane as a danger. One of the few things that can calm him down is his mother and the rest of his family. He also becomes enraged if he is given a cookie and is not allowed more. For instance, Jack-Jack loves Mozart's music to the point where he is stimulated by it.

Like many infants, Jack-Jack's emotions are unpredictable and since his powers are stimulated by them, being with Jack-Jack when the baby uses his powers becomes very difficult when attempting to pacify or restrain him. He laughs and giggles a lot but cries whenever he is disturbed.

My first jack rabbit demo