Captain Stone-7, Jokingly referred to as "Captain no-neck" by his comrades, is an Exo titan working for the LETM, the Lost Earth Titan Militia

The Lost Earth Titan Milita has one purpose only, reclaiming lost cities of Earth, and preforming "Deep Cleans" to make the cities a possible future safe haven for humanity, and other peace-seeking individuals. Stone-7 has a deep passion in protecting the innocent, and all who need help. Despite his confidence and protective nature, Stone often struggles with his sense of self, Often debating with his ghost on whether he can still be considered human, or if he even still has a soul, with his ghost often winning the debates.