(some spoilers for comedy about a bank robbery in this post)
i say to myself all the time that tcaabr reminds of of the movie version of who framed roger rabbit in the sense that in roger rabbit there's a main noir detective guy who's basically a regular detective who finds himself in a wild cartoony world, and absolutely mitch is just a straight up criminal bank robbert who is trying his best to rob a bank the regular way in a world that functions on cartoon logic...
and it's to the show's benefit really because mitch really brings that serious factor in his scenes, which lets the show go from very wacky hijinks to more serious drama more easily than many others, because the seriousness can sort of migrate with mitch. like, if mr freeboys said he were going to kill someone, you would say, "yeah, right, he's going to fire a gun and it's going to ricochet off of seven different surfaces before landing harmlessly on the floor." but when mitch says it, you're like, "omg he's gonna kill someone!" it lends real stakes to the show imo
also while i'm still rambling, i think that this is a little different than just a regular "straight man" role, which i think officer randy embodies much more. like, randy is also more of a "normal person" in a cartoon world, but he really isn't a threat to the protagonists, he doesn't have that same gravity that mitch does.