What I'm questioning is why use KKUTS in Party specifically and not Koikatsu or Sunshine?
In fact, it's quite the opposite.
KKUTS is a shader that enables and works quite well with the lighting and shadows in Sunshine (which is more polished than Koikatsu) – that's why it's used more in this version, and that's why there are Characards like SD cards and accessories that work with or use this shader by default, both in the game and in Charastudio. It allows you to create lighter shadows and add depth, although of course, this also depends a lot on the power of your GPU. My recommendation is to use it only for the body and hair if it's just one piece.
BUT, you can create textures that simulate highlights and shadows, and add rimlight (and apply the same to clothing), although it's not my favorite way of working.
Or simply not use any noticeable shadows or lighting in Charastudio. Now, I'm not saying you shouldn't use it in Koikatsu Party -Vanilla-; in fact, it works almost the same way there, although the limitations are hard to spot unless you're someone who pays close attention to the material editor sliders and the numbers or even the mask dimensions.
Anyway, this shader is very versatile and offers this alternative way of adding shadows and highlights to skin without breaking the anime aesthetic of the models.
Things are much more complicated and completely different with KKUSS, and unfortunately, this shader is very problematic, both because of the lighting and how fragile and unstable it is when you have to do animation with it.
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And here's another tip: when you create models, you might notice that the textures load very dark in Charamaker, both there and in Charastudio. Well, use this website:
https://gamma.imageonline.co/es/ Upload your texture, and increase the three color range sliders (Red, Blue, and Green). Apply it and download it. It might look strange at first, but when you load it into the game, you'll see a huge difference.
www.pixiv.net
