Finally, my own notions about characters (and plot and all the rest of the wretched business) evolve over time. I have found that no matter what I write, no matter how carefully I plan, at some point I'll be looking at a character file and think "no, that's not it at all." I usually wind up writing new notes below the old ones, just in case it turns out I have yet another change of heart. It happens.
Hi! I want to hang a bit from this because a similar situation of plot evolution happened to me. For example, last week a character, a ten-year-old boy, was rescued by rebel soldiers along with other children from an imperial home where imperial officers arrive all the time and sometimes they take up to half of the children who knows for what, but surely one of the motivations is to supply perverse networks of slave trafficking and even pedophiles. The point is, that kid was assigned a godmother or something.
But only now, a week later, the reason why they assigned that godmother to that child appeared and that it actually corresponds to a dispute between two women who love that boy (in a maternal way but also in the another) and one of them, so that the other woman would not stay with him, appealing to the Law and to her privilege of nobility (imagine a she Roman domina, with military power and others), demanded that that boy be assigned that godmother or tutor, since the another woman is also a military and given the danger they run all the time, she is prohibited by law from exercising maternal tutoring.
Now, what is all that long explanation about? To the conclusion that no matter how deep or detailed your outline is,
plots definitely tend to change over time, because as part of the very mental process of creating a story, the brain does not throw all the answers at you right away; somehow he also learns with the days and is throwing you conclusions as he finds them.
Therefore, my recommendation is that the scheme must have some flexibility so that it can resist those changes that you do not know will appear but they will, in fact, so that later you will not be forced to change too many things as a result of the variants that are they are producing.
But I think that in terms of character sheets it is convenient to have some annotation, but depending on whether they are going to be projected forward or not.
For example, in the case of that maternal dispute (and the another) of that officer woman and the noblewoman interested in that ten-year-old boy, even in the text I show by way of internal thought that the military woman is 30 years old in 1240 while the noblewoman has 25. Then, in 6 more years, that is, in 1246 (the year in which the division of the Imperial Army began to become clearer, with surgical blows that could only had be plotted by their own intelligence), for both it will be legal even require the refugee in marriage. But in 1250 not even the rebels will be able to believe when they see on the screens huge ships raising their battle flags, an army they never expected to have on their side, so I am still studying if I put those two women in one side or the other. Maybe they should forget their differences and join forces to fight together, I don't know, when the brain gives me the visual image (I always see the best fragments as scenes from a movie), I guess I'll have it clearer.
Therefore, these details should be noted down, because it allows us to make a following, say, historical. It avoid us the confusion and the dizziness of digging through the pages to see where I wrote this or that thing. Especially if your WIP is a river saga or novel with many characters.