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Quote1.png Jonni Thunder. A lass with a powerful friend. Quote2.png
John Constantine src

Jonni Thunder can turn into a four-armed avatar with a demonic appearance.

Jonni Thunder was imprisoned at Arkham Base alongside Henry King, Jr., Todd Rice and Jeremy Karn. They were released by John Constantine (Prime Earth) in order to help him return to his Earth.[1]

The group then arrive at the Chicago World Army refugee stronghold whereupon they witness Barbara Grayson's death and the group slaughter the men and board the train, and whilst the train begins to depart Richard Grayson hands his son over to her as he awaits his death from the coming tidal wave.[2] Upon their arrival at Atom's Haven Brainwave tells Todd and Jonni of his plan to entrap the minds of the refugee-seekers to better enable their transition into the space ship he had acquired and they agree to assist him with this. Jonni finds Todd, Ted Grant and Richard Grayson about to fight and stops them, telling Rice that it's only fair to let him know about his son and the two inform Grayson and Grant of Brainwave's plan.[3]

Obsidian tells the two to follow him through the tunnels to find King, Jr. but Brainwave takes control of Jonni's and his minds leaving them powerless to stop Brainwave from nearly killing Grayson until Batman and Huntress render him unconscious and free their minds.[4]