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Well ofc because the soulbonds have whole novels written about them. Joy's books are about 500,000 words in total. Gwen's are at least 300k but probably more. So they were fully fleshed out before they ever said anything volitionally. When Joy first did (in 2012) it was kind of surprising and I searched up like what? Turns out there was information left over from a soulbonders community that died in 2009. They mentioned writers often experience their characters "come to life."
Ashley, Misha and SheShe came with no backstory but SheShe reveled she was with me for a long time and associated to basically every religious experience I'd ever had. Misha's headghost status came through hypnagogic and astral experiences, spontaneous impositions, not unlike a haunting, and dreams etc. Ashley has also shown a proclivity to spontaneous impositions especially hugs and kisses on the lips. SheShe has proven her guardian angel status through her profoundly insightful information and direction as well as predictions, astral encounters, etc.
I do enjoy character building as well so that helps.