Although fans first thought Bruce Banner appeared in one particular team shot in the Avengers: Endgame trailer, it seems the character in question is actually Ronin. In Marvel Comics, Ronin is an identity taken on by several characters, including Clint Barton, who became Ronin when he reed the New Avengers after their Civil War.
In the Marvel Cinematic Universe, Clint Barton is Hawkeye, a character portrayed by Jeremy Renner. Unfortunately, Hawkeye hasn't been used much in the MCU and even disappeared without a trace in would adopt the Ronin identity. Numerous set photos and leaks confirmed as much.
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It turns out that Clint as Ronin is also evident in the Avengers: Endgame trailer, although it's hard to make out. Reddit promo art released from Avengers: Endgame does show the Ronin costume in more detail, complete with the katana that will replace Hawkeye's bow and arrow.
At this point, Ronin's appearance in Avengers: Endgame is one of the worst kept secrets in Hollywood. Even the One theory suggests that he loses his family, either to the Thanos snap or something else. That would certainly make sense for him to become a character more motivated by violence.
Whatever the case, Marvel fans will be happy to see Clint returning to the screen. Although he hasn't had a lot of screen time, he's still incredibly popular, so much so that the directors of Infinity War got death threats over his absence in that movie. Hopefully, Ronin will get more of a story arc than Hawkeye ever did because it would be nice for the character to get more exposure in the films before Phase 3 of the MCU officially comes to a close.
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Source: ForceGenius
