He was the Frenchy guy.  I didn't recognize him either.  But I love that Thor's group are, like, the ultimate versions of warriors from all these different cultures.  You could totally imagine any of them getting their own spin-offs or showing somewhere else, like Sif did on Agents of SHIELD.  That's something I actually really dug about this movie (and so many Marvel movies0, you get the sense that the characters actually do this kind of stuff in their normal lives, and the movies are just when they run into each other by random chance or dire circumstance.  It's not everyone waiting until the next movie, Thor's kicking butt in other dimensions, Natalie and her crew are going around the world trying to find wormholes, Captain America and Black Widow are doing all kinds of weird covert ops, Tony Stark's still inventing sh*t, etc.