Based on the naming convention typically used in the game's modding and character-sharing communities (like the Koikatsu Sunshine/Party Discord or IllusionSoft subreddits), Likely Contents
Most creators design characters using the "HF Patch," which includes a massive library of community-made hair, clothes, and technical fixes. Without this, the character may appear "bald" or with missing textures. KK_(RU)_YT_Girl_015-Lesbian.rar
Essential modding frameworks used to load the custom assets contained in the archive. Based on the naming convention typically used in