Pantser

A pantser is someone who “flies by the seat of their pants,” meaning they don’t plan out anything in their story, or plan very little.
Freedom is an important value for pantsers. They don't need or want a detailed scene-by-scene outline. In fact, their writing style—for a first draft or senior book—is partly about discovering the story as they write it.
They like to get lost in their story. They like to let the main character and their imagination lead them to a surprising finished product.