Bruce is the weapons specialist of the squad. Most, if not all of the squad's weaponry comes from his personalized arsenal. Most would assume he's just a support unit, and nothing more. But aside from his heavy armor and weapons he carries, he is also a natural leader second to Gavryn. Even when he isn't on the battlefield he is super observant. 

Bruce doesn't say much when things are quiet, so his role doesn't have as many voice lines, but for the few times he does have a drawn out conversation, it's very impactful. On the flip side, he'll raise his voice slightly when in combat. Not in a enthusiastic manner, but more a assertive and informative tone

If you plan to voice Bruce, keep in mind that I'm not sure how many voice lines he'll have. It could be a lot, or it could be slightly less. There is definitely a possibility he will play a bigger role in the game after this