The Doom Slayer.
It'd be really funny to have this giant hunk o' meat just standin' around, looking at everyone menacingly, not saying a word, while the team just does all the work. Occasionally, they'll be like "We have to do this next thing very carefully," then Doomguy just tears it off the fuckin' wall.
Then they finally find the thing they've been chasing, and before they can even get the "Let's take the mask off" moment, Doomguy just rips it in fucking half and leaves.