It could be really interesting. Imagine Daryl from The Walking Dead in the world of Twilight. Daryl's survival skills would be put to a very different test. In the Twilight world, there are vampires and werewolves. Daryl, being used to fighting zombies, would have to adapt to these new threats. Maybe he'd form an unlikely alliance with the Cullens against a new kind of undead that combines the traits of zombies and vampires. His crossbow would be a unique weapon in that world full of supernatural powers.
One plot idea could be that Daryl is bitten by a strange creature in The Walking Dead world, and instead of turning into a zombie, he's transported to the Twilight world. There, he discovers that the bite has given him some sort of immunity or power that the vampires and werewolves are interested in. He has to navigate the politics of the Twilight world while also trying to find a way back home. Another idea is that the zombie virus somehow spreads to the Twilight world, and Daryl teams up with the Twilight characters to stop it from taking over. His knowledge of fighting the undead would be crucial in this situation.