On each Lecture day, a student might come up and propose a change of goals, the game labels them as an "Area of Focus". Whether you accept or decline, it gets added to their list of Goals, with a custom title
For example, here's Petra offering to focus in sword/bow:
Then when going to Goals in the Menu, you find it's called "Thief With a Heart of Gold"
I liked these, because it's flavor text for each character, as both their explanation and the Goal's title is tailored for that character.
On my 2nd playthrough, a Blue Lions path with the goal to prep for New Game Plus, I started cataloging whichever Goal change popped up, and it's nowhere near complete.
https://www.dropbox.com/sh/evgcd9vb4a5wwc1/AADwVLPO4kYBK5QvBgnvWQKma?dl=0
Since I recruited all students, Dimitri never came up once, and I liked his offers on my first playthrough, haha. One of them mentioned about following in his father's footsteps.
This is probably something that can be datamined, but I'm not too sure where to look for it at the moment. So I linked what I've collected so far. I got 2 of Anna's too in there. I'm guessing for each unit there's 3 at most, as a good handful of them have gotten that, but not sure if it applies to everyone.
I'm in the middle of a Golden Deer playthrough, and the only new ones I've gotten was one for Annette and two for Claude. I only recruited Annette, Ingrid, and Petra for this run, as they have supports with Claude.
Here is a pastebin I got from datamining all the flavor text: https://pastebin.com/DHtnfctw