in terms of memories i think satoko is going to largely be haunted by memories of her brother, specifically i'm thinking her brother murdering her aunt, and then a while before that, satoshi and mion founding the games club to make satoko happy.
i think i might have her get lost in the woods since it's a satoko fact that she used to hang out in the woods and create deathtraps, so someone might have to help defend her against the wolves that escaped her viet kong esque spike pits