Jack

Jack is a skinny blond teenage boy in the Claire's Impossibilities book series.

Chaotic Rooms
Jack is one of the hackers within the virus, but since he wakes up so late in the operation, he has minimal effect on the operation. He, other than Claire, is the only one who exits the Dyson Sphere Storage Facility without dying.

Impossibility
Jack gains the ability to change the distance between molecules without changing their temperature. Jack uses this ability both defensively, as a liquid shield, and offensively, as projectiles. Jack participates in the team v team battle and in a 1v1 battle with Cole.

Soulless
In Soulless, Jack has a gray aura color that is described to be stronger at his feet. Exactly what this signifies is unknown.