How do i use Koikatsu Party Characters or Honey Select chars for my VN?
1. Open Koikatu (Chara Studio)
2. Add a new character, select it, click anim -> animation and select a pose.
3. Take a screenshot with F11.
4. Drag the screenshot in your renpy game folder.
5. show the image and write random dialogue lines that everyone will skip.
6. Build the game, release and name your version "00000.001" to make sure to let everyone know to play with zero expectations, while showing your good will of making tons of updates to your game.
-source: I use Koikatu for all my projects.