Best Characters First Introduced in the Marvel Cinematic Universe

Characters that never appeared in any comic or in any other media are originally made for the MCU
The Top Ten
1 Phil Coulson - Iron Man (2008) Phil Coulson is a fictional character appearing in American comic books published by Marvel Comics. In the Marvel Cinematic Universe, he is portrayed by Clark Gregg.
2 Sylvie Laufeydottir (Lady Loki) - Loki (2021)
3 Luis - Ant-Man (2015)
4 Michelle "MJ" Jones - Spider-Man: Homecoming (2017)
5 Layla El-Faouly - Moon Knight (2022)
6 Darcy Lewis - Thor (2011)
7 Floor - Guardians of the Galaxy Vol. 3 (2023)
8 Katy Chen - Shang-Chi and the Legend of the Ten Rings (2021)
9 Erik Selvig - Thor (2011)
10 Ralph Bohner - WandaVision (2021)
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