It’s no secret that the break-out characters of the Marvel Avengers franchise was SHIELD Agent Phil Coulson. He stole every scene he was in through six movies. Even though he might be dead (but alive in comics continuity), Coulson is still popular.
Marvel and Mighty Fine have a line of Coulson inspired t-shirts! You can view all five shirts in the line here. My favorite is the one pictured, which lovingly pays tribute to Jim Steranko’s cover for Nick Fury: Agent Of S.H.I.E.L.D. #4.