You can't customize your friends. You screen for certain traits, but what you're drawn to, as much as the trait's performance, is the 3D process that forms it: your friend's life story. We surmise, based on our affinity, it will be a story we share. We choose our friends because we want to live in the universe of their personality: its past, present, and future. What gives a personality dimension is time, the gathering of experiences.