Iron Jack

Iron Jack is a transforming A Class Ajax-Type. He is one of the founding members of the Chicago Sentinels, but became a reserve after having children. He has been able to maintain a secret identity because of his ability to unrecognisably transform himself (in his Iron Jack form, he closely resembles a statue of iron plates and rivets).

As Jack Corrigan, he is a highly successful Chicago architect, and he experienced his breakthrough on the day of The Event. He kept the secret of his alter ego from his children, which gave Astra a second shock on the day of her own breakthrough.