|For alternate versions of Jemma Simmons, see Jemma Simmons' Character Hub|
Jemma Simmons was the Life-Model Decoy of the real Jemma Simmons, used against Aida into tricking her to believe that she actually killed Simmons. Aida eventually discovered the ruse when the real Simmons revealed herself as the trap to lure Aida to Phil Coulson where she could finally be destroyed.
After Leo Fitz returned from the Framework and rejected Aida's love for him, Aida grew an immoderate desire of revenge on Fitz. Phil Coulson decided to use this in order to lure Aida into a trap where she would seemingly kill Jemma Simmons, Fitz's girlfriend and true love. Therefore, S.H.I.E.L.D. decided to replace the real Simmons by a Life-Model Decoy who would accompany Fitz in the Playground.
It is unclear whether the body replica of Simmons was created by Holden Radcliffe and Aida as they had planned to replace all S.H.I.E.L.D. top agents by LMDs or if S.H.I.E.L.D. created the body replica itself. Anyway, S.H.I.E.L.D. mapped Simmons' brain and uploaded the data in the replica. Afterwards, Fitz took Simmons' LMD with him in the servers room of the Playground, where Aida quickly found and confronted them.
While Aida blamed Fitz for rejecting her and thus making her suffer, Simmons' LMD grabbed a screwdriver and tried to attack Aida from behind. However, due to her Inhuman powers, Aida quickly reacted and overpowered Simmons' LMD, stabbing her in the chest with the screwdriver and threatening to kill her. Acting like the real Simmons was about to die, Fitz told Aida that he would help her retrieve the Darkhold and come with her while Simmons' LMD blamed Fitz for everything that had happened. However, Aida was determined to make Fitz suffer and used her electrokinetic power to kill the LMD that she believed to be the real Simmons. Aida then left a shaken Fitz with the destroyed LMD, ignorant of the fact that she would soon meet the real Simmons.
- Aida † - Killer