This is actually something I considered when designing my Manager.
Some things I kept in mind with my manager was to make sure he paralleled my Kayne. My Kayne can split his face apart as a “mouth”, so I knew my Manager would not allow it to open. He doesn’t want to be scary, to be a monster, so he will do anything to keep it closed, even stapling his face closed. I also wanted it to look like he’s slightly nervous, like his smile isn’t completely happy. I also wanted his teeth to look “perfect” like he’s too strict with himself.
The Manager is deeply restrictive of himself and I wanted that to come across in his design.
Did y'all hear how the Manager kept choking off his laughs every time they got too loud or too genuine, refusing to sound like Kayne? Did y'all hear how he kept suppressing pieces of his nature out of fear and shame, even if those pieces were full of joy or comfort? Did y'all hear how he kept rushing to kill the parts of himself that he hates?