In the game's main menu, you'll find a "Credits" button. I listed there the software I used to work on the game. And links to take you to their respective sites.
Vendena
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A member registered Aug 04, 2019 · View creator page →
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The characters of HR are separated in three categories.
The main nine heroines, who live with you and get most of the focus.
The side heroines, who have some story and events.
And the EXTRA characters, who are just there for support roles. These don't have much story, or events, and are tied to someone else entirely. That's why they don't get their own profile, hints and stats.