Thread:ArtDraw12/@comment-28245851-20200729153906/@comment-28245851-20200729210212

You really answered your own question with your last paragraph. Important relationships can be detailed in other sections, often being stronger too. Like Aoi and Sakura as you mentioned, they're important enough to each other their relationship affects both history AND personality, ie even years after Sakura's death, Aoi still misses her, and even quotes her in DR3.

How characters treat another, for example, can be in personality. Such as how Byakuya looks down on everything, and few stand up to his standards.