I need help with characters organization

full image - Repost: I need help with characters organization (from Reddit.com, I need help with characters organization)

Hii! So, I'm using this site, reedsy, to write my stories and I realized that at some point of the writing I keep forgetting some details (like side characters names and the relationship network of them) and I want any recommendations of sites and softwares that can help with organization when it comes to it, do you guys know any? :)

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