Well, that will depend on how we want to handle this. I was thinking of having a stat based system taken pretty much directly from the games. Each persona has stats in Str, Mag, End, Agl,Luck, and i think one other. in this case, I'd say that building your links strengthens your stats. So if you interact with a person of the magician arcana, your mag stat may go up a bit. Greater bonds bestow greater benefits. Otherwise, without stats, we can simply state that your persona grows the more you interact with others. I plan on having NPCs to interact with, but you can also form bonds with your team mates too.