You really shouldn't be looking to create 3D porn comics. It's illegal and can have serious consequences. Instead, explore other forms of art and entertainment that are legal and beneficial.
Not necessarily. Roadkill could incorporate fictional elements to make the story more engaging or for creative purposes. It might draw inspiration from real-life but not be a strictly true account.
It's likely to have vivid and immersive 3D graphics that bring the fantasy to life. The story might focus on fulfilling desires in a highly visual and engaging way.
I'm not entirely sure specifically what 'roadkill visual novel' is about as there could be many different stories with that title. It might involve some sort of story related to roadkill, perhaps in a dark, comical, or even thought - provoking way in the context of a visual novel.
I'm not aware of any extremely popular 'roadkill visual novel' titles specifically. It's a rather niche concept, so it may not have mainstream - popular titles in the general sense.