Holden Radcliffe

Holden Radcliffe is a robotics expert and S.H.I.E.L.D. consultant, and the inventor of Life Model Decoys. He appears in the ABC TV series Marvel's Agents of S.H.I.E.L.D, set in the Marvel Cinematic Universe, as an anti-villain in the second half of Season 3 and main antagonist of the LMD story arc in Season 4.

Early Life
Radcliffe was born in Glasgow, Scotland. He went to college at some point with Leo Fitz's father, developing an obsession with human enhancement through technology, a process known as "Transhumanism". His robotics expertise landed him a job at a company called GT Argochemical, but his experiments with machinery was dubbed too inhumane, and he was promptly fired. He was forced to move to Romania, where he continued his practice on Transhumanism; he would later fit himself with a robotic eye.

Season 3
In early 2016, he was located by S.H.I.E.L.D. members Leo Fitz and Jemma Simmons, who had come to Romania to seemingly show him their own device, a robotic eye built by Cybertek. They were taken into a basement where a man (Radcliffe) was kept under a blanket, eye exposed; the challenge was for Simmons to remove the man's eyeball and replace it with the one they brought with them. Simmons eventually noticed the difference between a real eye and a fake one and, seeing Radcliffe's robot eye for what it was, stabs a syringe into it; no blood came out and the man was unharmed. The man takes off the blanket and shows himself to be Radcliffe, and was impressed by Simmons' attention to detail. He noted that the eye they brought was from Cybertek, which was owned by HYDRA, which infiltrated S.H.I.E.L.D. They assured Radcliffe that they were not from HYDRA.

After noticing that they were talking to someone through a communicator device, he told his partner Anon to activate an EMP, only for the doors to burst open. In steps Daisy Johnson and Alisha Whitley, Inhumans who were being mind-controlled by Hive, who wanted him to develop technology that could help him in his goal. Radcliffe is taken away and brought to Union City far away, and wakes up to find Hive telling him to recreate the Kree experiment that turned him into an Inhuman thousands of years ago. The experiments that followed were unsuccessful, as Radcliffe lacked actual Kree DNA, and Hive's own blood was of no real help. Knowing what had to be done, Hive used a Kree Orb to summon two Kree Reapers. Hive ripped the heart out of one of them and gave it to Radcliffe, while the other was killed by Daisy and dissolved into a pile of dust by a Splinter Bomb, rendering it useless.

Ghost Rider
To be added

LMD
To be added

Trivia

 * Radcliffe seems to have characteristics shared with Tony Stark/Iron Man; they both use robotics to the degree of creating a full-fledged AI, and they both put their own AI into a physical body. They both had also been called out for immoral, unethical behavior, which was directly tied-in with their technological obsessions.
 * In the original comic books, Radcliffe owned a company called Holden Radcliffe Corporation, which developed cutting-edge robotics.