I admittedly haven't used Fuji Natura film much - only two times - but after getting examples for this post I'd love to use it more, except I don't want to pay for it. It's a very versatile low-light film that has a ton of latitude in daylight and low-light situations.
One roll of film is a whopping $12, way more than 400h or Portra films. It's only manufactured and sold in Japan which contributes to its high cost. It's known for its excellent colors and fairly fine grain for a high-ISO 35mm film. If you're not a fan of pushing lower ISO films you should give this one a try!
Many photographers prefer shooting Natura 1600 at 800 ISO instead of 1600, and you'll see below why that is. (I even read some blog posts of photographers shooting it at ISO 100 with great results!) The grain isn't as noticeable at 800, and just like any other color film, Natura does well with at least one stop of over-exposure.
Below is an example of the films' versatility. I used it during a Night Walk on a recent trip to Costa Rica (it was amazing!) and rated it at 1600. I didn't use the whole roll that night so decided to go for it and use it up the next day (still at 1600 obvs) and got great results.
Now here are a few more examples of Natura 1600 rated differently: