ROUND 1 ANSWER
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Closest Main Character Associate: Agent Phil Coulson
From The Comics: One of the top recruits in his S.H.I.E.L.D. Academy class, this character rose through the ranks of the clandestine organization and was Nick Fury’s assistant for a time (he was even temporary director at one point when his boss went M.I.A.)
In The Movies: He is portrayed as a hard-working, high-level S.H.I.E.L.D. agent in multiple MCU features, shorts and television episodes (played by Maximiliano Hernández), but his dark secret is revealed in Captain America: The Winter Soldier: all along he has been an undercover HYDRA agent.
"Zola's never wrong! He predicted it all!"