When I think of "dark" and "fruit" in the way you describe, I think of fruit that is overripe or rotten, when the sweet scent of decay mixes with the sweet scent of the fruit.
If you search "rotten fruit" or "decayed fruit" (in quotes) in the basenotes search engine, you will find reviews for different fragrances that contain that quality. That may be one place to start.
When I think of "dark fruit" I also think of Serge Lutens "Arabie", but it does not have a "tropical" vibe. If I were to create a "dark and tropical" mash up, I would imagine it to be something along the lines of Lutens "Chergui" with the addition of perhaps something like a coconut note underneath the dark smokey woods, spices, and tobacco.