The slice of life elements are really going to be... different. And that's only looking at the characters that we have now xD 

I think Trouv's weapon will be a rapier so he'll he Sarah when he needs it sharpened and whatnot. Emil and Aldis prolly show up at the bathhouse because of how laborious their jobs are, so they'll know Trouv from there. In addition, because sentinel is supposed to keep the peace maybe Aldis (or a bunch of the characters) is suspicious of him. He wouldn't really need need for a scribe, but maybe he know Roosevelt by town gossip and by sight. Kotoe is a witch, so I'm sure the two have a lot to talk about. Maybe they even consider each other 'rivals'.  I suppose Trouv can go for a drink every now and then and makes some small talk with Pisco. These are all generalizations of course, but I want to make sure when I describe some of the other characters through Trouv's eyes no ones like NO MY CHARACTER HAS NEVER GONE TO THE BATHHOUSE STFU