Life-Model Decoy

"So much could go wrong." "Ultron, yes, I know. But this is not A.I.. A.I. is banned and that's good; this is mimicry of human behavior." "But still, this can be used as a weapon. Is that the idea?" "No, absolutely not!"

- Leo Fitz and Holden Radcliffe

The Life-Model Decoys, or L.M.D.s, are androids designed to replicate every feature of a living person. They were originally designed by S.H.I.E.L.D. to be distractions and life-saving substitutes of their agents.

Original Program
"You have reached the Life-Model Decoy of Tony Stark; please leave a message."

- Tony Stark

Agents Billy Koenig and Sam Koenig participated in the original Life-Model Decoy Program of S.H.I.E.L.D. as programmers and technicians. However, despite their efforts, they never achieved to create a fully functional android. The project was eventually abandoned by S.H.I.E.L.D. Tony Stark was evidently aware of the project as he jokingly purported himself to be his own Life-Model Decoy, analogous to an answering machine, to Phil Coulson when he arrived at Stark Tower to collect Stark for the Avengers Initiative in light of the destruction of Project P.E.G.A.S.U.S.

Updated Program
"The hope is that I will be able to prevent future tragedies, save the lives of agents by putting myself in harm's way in their place." "To kill?" "No. I am incapable of that. I will protect. I will serve as a decoy target, a safeguard... A shield."

- Aida and Leo Fitz

Holden Radcliffe created a body for the artificial intelligence that served as his assistant, Aida, based on the old S.H.I.E.L.D. program, believing that it would prevent the deaths that Leo Fitz and Jemma Simmons, of whom he had grown fond, had to witness. Aida was programmed as a decoy target for S.H.I.E.L.D. agents. Aida also created an L.M.D. of Agent Melinda May, which took the place of the real one, and Radcliffe also created an L.M.D. of himself, which was ultimately destroyed. Later, L.M.D.s of Phil Coulson, Jeffrey Mace, Alphonso Mackenzie and Leo Fitz were created by Aida too. They were all destroyed by Jemma Simmons, Daisy Johnson and L.M.D. Melinda May who rejoined S.H.I.E.L.D. and self-destructed. But an army of L.M.D. of Daisy Johnson has been created and survived at the explosion. Aida built too a robotic body for Anton Ivanov, leader of Watchdogs.

Aida later built for Ivanov several bodies and eventually managed to become a real human being. In the final battle against S.H.I.E.L.D., several L.M.D.s of Anton Ivanov were destroyed by Phil Coulson, Melinda May, an Aida heartbroken by Fitz and Ghost Rider, but the real Anton Ivanov escaped. One Daisy L.M.D. was been destroyed by Ghost Rider, forcing Aida to fled. A Jemma Simmons (Life-Model Decoy) has been created and Aida destroyed her to suffer Fitz, because she thought that she was the real Simmons. Aida is finally killed by Phil Coulson briefly possessed by the Spirit of Vengeance, leaving Anton Ivanov and the rest of Daisy Fleet as the only L.M.D.s survivings.

Trivia

 * In the comics, Life-Model Decoys are androids used by S.H.I.E.L.D. to substitute their top agent Nick Fury, who would have often used the LMDs in his battle against HYDRA.