Amadeus Cho is one of the brainiest characters in Marvel Comics lore, so smart that he was once chosen to stand in for Ant-Man. He's also had stints as a substitute Hercules but is best known as the Totally Awesome Hulk.
You might not have realised it, but Amadeus made his Marvel Cinematic Universe debut back in 2008. Apparently, he was the computer nerd who Bruce Banner gives his pizza to in The Incredible Hulk.
The character's identity was confirmed in the movie's official novel, so whether it's canon is debatable, but Amadeus's mother Helen was a supporting character in Avengers: Age of Ultron, so perhaps the MCU hasn't seen the last of the Cho family.
If Amadeus does make another, more official MCU appearance in the future, he's unlikely to be played by Martin Starr (who took on the role in Incredible Hulk), as he has since portrayed school teacher Mr. Harrington in Spider-Man: Homecoming.