Ripe fruit is a must and tender greens like bib lettuce are important too. I pretty much always have ripe bananas around, not because they're absolutely necessary in a raw diet, but because they're calorically dense, available, cheap, and very tasty.
In fact, their is no fruit or vegetable that you must eat for health. Just eat a good variety of fruit, greens, and limit your nuts, seeds, and avocado and that's really it! :)