Jack Jack is an infant, at first thought to be the only "normal" one among the Incredibles (the Parr family). However, under pressure with the absence of his mother for an extended period and then with the kidnapping by Syndrome, Jack Jack has begun to manifest a variety of strange powers. It's unclear how this will develop for Jack Jack... Being an infant, Jack Jack seems generally quite jolly but like any little child prone to outbursts.

An easy way to incorporate that essentially the Incredibles would, naturally, do anything for Jack Jack, their infant one. Although Jack Jack's powers aren't readily apparent, it should be noted he rotated among three different forms, but each seemed elemental in nature, rotating through a being of all fire, a being of some sort of very heavy metal, and a devil-looking form. Although this could be a Multiform, at this point it's probably best to represent this via a VPP, with a limitation being that the VPP power(s) in play at any time must all reflect a simple elemental type of being.

      Combine this with some dice of "Fire Form" for the full devil-being effect.