Could you please give me a better grip of a First Lieutenant character? His commanding officer is a Captain. I would like to know possible routines and/or errands a man in such position would get. Even small things that could get me to understand the character better. I am also aware it's not that high of a ranking, but still..?
First lieutenants will typically either be platoon leaders or company XOs. In either case his commanding officer will be a captain, (because that’s just how the army works) but if you want him working closely with/associating with the captain, you’ll probably want him to be the company XO. You can read a post I did about XOs here, though it is a little small so if you need more info than that you can always ask for more specifics! Without knowing exactly which position he’s in there’s only so much I can actually tell you about lieutenants.
I guess the easiest thing is the thing you already know: as far as officers go, it’s not that high a rank, so other than the automatic respect they’re guaranteed as officers, we don’t care about them that much. It’s not uncommon for a PFC or a specialist to have been in longer than a first lieutenant and to therefore have more practical/applicable knowledge. In my experience lieutenants are in purely supportive roles and it’s uncommon for them to really act as stand-alone leaders; even as platoon leaders they’re really co-leading with their platoon sergeant, and tbqh the platoon sergeant is doing the bulk of the work imo.
And in our job it was exacerbated because the lieutenants in our section weren’t required to know our jobs, but they had to oversee every aspect of our job, which made them unbelievably annoying when we were trying to work and they were trying to stick their noses into our business and worse yet when they were trying to tell us how to do our jobs and they were just like…so flat out wrong you wanted to face desk every time they spoke.
So for me, the ideal lieutenant was one who was aware of what their role was, did it competently without either micromanaging or overdelegating, and didn’t feel the need to throw their rank around to feel important. Oh yeah, and it’s not uncommon for us to just call them LT, like the letters L-T. Certain lieutenants might not like that but when we were working in a room with a lot of officers, it was a lot easier than saying “Sir?” and half the room looking up at you.
As always I recommend taking a look at the notes to see if anyone has different experiences with lieutenants you can apply to your character.
Also I’m being mean: I liked most of my lieutenants. They were usually a lot more chill than the other officers and were self aware and were more willing to listen when we had an issue. Some weren’t, but that’s just how some people are in the army.