MCU original characters are not too many to count. But they have certainly made quite an impact. These MCU Original characters are the cream of the crop in the movies.
Fans took a liking to Harley Keener the moment the young kid entered the scene in Iron man 3. Iron Man’s suit malfunctions and he is stranded in the middle of nowhere. Harley allows Iron man to take refuge in his residence and the banter between the two is the stuff of legends. Tony may not be that happy and enthusiastic at meeting Harley but Harley sure is. He idolizes Tony Stark and considers him his hero. Of all the MCU original characters, it is Harley who appears again in Avengers: Endgame’s final moments during Tony Stark’s funeral scene.
No one can ever come close to Luis and his storytelling technique. Ant-Man was a movie with many highpoints but the best of the lot was probably Luis, one of the best MCU original characters. Scott Lang’s greatest ally, Michael Pena’s character is integral to how Lang embraces the Ant-Man mantle. In Ant-Man & The Wasp, Luis shows he is more than a criminal and tries to start a legit business. The guy is pure bonkers and we love him for it.
Doctor Erik Selvig played a very pivotal role in Phase 1 of the MCU. He helped Jane Foster in her research and in the first Avengers movie, it was him that helped Loki unlock the secrets of the Tesseract. In Thor” the Dark World, the God of Thunder took his help in putting an end to the Dark Elves’ reign of terror. He is now mostly a redundant character and will probably be seen very little in future MCU movies.
Agent Phil Coulson is the ultimate Captain America fanboy. A benevolent soul and an all-around average guy, Phil Coulson’s death helped jumpstart the Avengers, bringing the Earth’s mightiest heroes together as a group with a purpose. Coulson then too his leave from the MCU movies and headed Marvel’s Agents of Shield, which ended up becoming a cult-classic.
Who knew Kat Dennings of all people would play one of the most beloved comic relief characters in the MCU?!?! Darcy started out as an aide to Jane Foster, helping her in her research. In The Dark World, she took on a more significant role. But it was only in WandaVision that Kat Dennings’ Darcy shined bright. Her expertise was crucial in deciphering the Hex anomaly and helped Monica Rambeau take down the bad guys. It would be nice to see her back in action again in Thor: Love & Thunder.
The man known as Trevor Slattery would obviously divide the fans. That much even the Marvel Cinematic Universe. And yet, we saw Slattery in action in Iron Man 3. Ben Kingsley did a very good job at playing the fake Mandarin. But his portrayal of Trevor Slattery inadvertently destroyed the legacy of one of the most iconic Iron man villains of all time. Slattery appeared again in Shang-Chi & The Legend Of The Ten Rings, in a more comedic role.
The MCU ended up taking an original supporting character from the comic books and giving it a whole new twist in the name of creating MCU original characters. Edwin Jarvis is actually Tony Stark’s very human butler in the comic books. In the MCU, JARVIS is an artificial intelligence construct that helps Tony in creating, developing and maintaining his may inventions, including but not limited to the Iron man technology. JARVIS dies at the hands of Ultron but Tony manages to bring it back from the dead and give it a physical body in the form of Vision.