Thats a nice idea

Like ZeroZet said, but then again there are units without event dialogues (the ones you usually pull from gachas), so you might end up making your own dialogues :P (ofc keep them as close as possible to the characters).

One thing you might use iiiis this:
http://image01.seesaawiki.jp/a/s/aig...ce20109abb.png
It's basicly a sheet of most of ingame characters and their relationships with others. You will need some translations tho

I was thinking about RPG Aigis like 2 days ago, i hope you succeed in it, and make it look pretty and with nice gameplay, also make sophie op as fk pls xD