Jet is a Jasper Doll, an artificial humanoid weapon created by the Artifact Foundation. He operates under the command of Erenfried and Director Yorgo, dutifully executing their orders. Initially emotionally detached and obedient, his missions involve gathering data on Angelique, pursuing her, and attempting her capture during encounters.

His designation as a Jasper Doll fuels internal conflict, especially during interactions with J.D., another Jasper Doll. Jet brands J.D. a "defective product" for displaying emotions and forming human relationships, an assessment that subtly challenges Jet's own understanding of his existence.

In the second season, Jet's duties expand to guarding Mathias after Mathias allies with Erenfried. He participates in the effort to rescue Director Yorgo from imprisonment, demonstrating loyalty to his creators. During this period, Jet develops an infatuation with Angelique, complicating his mission-focused behavior. Exposure to Angelique's group, particularly after J.D. rescues Erenfried, contributes to his nascent recognition that artifacts like himself might possess emotions or "hearts," though this realization remains underdeveloped.

Jet's ultimate fate remains unresolved as his storyline concludes without definitive closure regarding his evolution beyond a weaponized tool.