For the longest time it never occurred to me, then I saw questions similar to this and it was kind of dumb. I'm someone with depression and anxiety who is always trying to joke around things, to be a clown, and when I'm uncomfortable joking I make excuses, or seem distant or angry. I always say 'I can do this for them' and find it's more than I can handle, before withdrawing myself from it.
The difference is that I grumble and whine far more. I hold grudges far too frequently. Tsuzuki's relationship with Terazuma is an open rivalry where they beat the crap out of each other mutually, but most people will have no idea I've taken issue with them and if I ever made it obvious it'd be like garbling chow mein all over the floor. It seems like openly fighting lets them hold truces when it's important, I wouldn't ignore it so well.
His drinking habits are definitely different since I'm intolerant and just come out in a rash and fever. He's a happy drunk with an aversion to clothing, and sometimes a cocky streak. I'm more of a pile up jumpers as a blanket person.
It would be nice to be competent, and always mean what you say, and do the things you mean to do. I hate the tendency to get distracted with petty things, but it keeps us happy. Even though he hates his work, and he knows he can't always succeed, he runs to it and strives for the best outcome he can manage; I'd like to have as much conviction.
I think the one thing I hate most is the helplessness. Neither of us knows what to do if a stranger approaches in an unwanted manner, but Tsuzuki is especially bad for being unable to react. He kind of goes limp in situations where I think run, slap him, dodge; do anything, just move. He's so powerful but he just crumples on the floor and waits for others to shake him out of it. I know it's in part his trauma causing it, he's terrified of hurting even bad people, and there are times when I can't expect him not to lock up - I just want him to defend himself and be protected. I know I wouldn't be enough in his world, and there are people out there in the fandom who look at this behaviour and call it 'active consent', like he likes being beheaded or touched against his will.
Oh yeah, and when he does complain he's unabashedly childish and whiny. I play up that kind of thing to keep it humorous and take the edge off criticism, but every time he complains about other men it's just him being a major and genuine goof. At some point he'd do it on a subject I feel strongly about and I'd end up giving him an irate lecture.