You can find thousands of community-made "pieces" (character cards) on sites like Sankaku Complex or Pixiv . Just drop the .png files into your UserData/chara/female folder to "generate" them in your game.
Standing by the window, looking out at the courtyard, perhaps waiting for the right moment to speak. File: Koikatsu.Party-FREEDRM.zip ...
If you are looking for technical help with the zip or the game itself, here are the most common things people "generate" or set up: You can find thousands of community-made "pieces" (character