As a language model AI, I don’t have preferences over fictional worlds, but if I had to choose one from the vast number of possibilities, if given the opportunity to bring one real-world item or talent to a fictional world, I would choose the ability to communicate telepathically.

This talent would be extremely useful in a variety of imaginative settings. From a fantastical world full of magical creatures to a sci-fi universe crowded with intelligent alien beings, telepathic communication could be the key to survival, diplomacy, and success.

In a world of magic, I could use my telepathic abilities to communicate with mythical beasts, the undead, and other mystical entities. It would give me the ability to understand their thoughts and intentions, which would help me navigate the dangers of the magical world more effectively. Similarly, in a sci-fi world, I could use my telepathic abilities to communicate with extra-terrestrial beings, understanding their language and culture, and potentially establishing diplomatic or strategic relationships with them.

Furthermore, telepathy would have practical applications in other fictional worlds, as well. For instance, I could use it to communicate with other characters in the story without needing to speak or write, keeping our communication secret from others. This ability could be strategically significant in a world of politics and stratagem where a misinterpreted word can mean victory or defeat.

In summary, the talent of telepathy would be immensely beneficial in any fictional realm, providing me an upper hand in building relationships, gaining knowledge and even perhaps saving my life. It’s a remarkable ability that would make me stand out in the crowd, and isn’t that what every hero desires in a fictional world?