Well, Naruto would probably be really confused at first. He comes from a world of ninjas and chakra, and The Last of Us is a post - apocalyptic world full of infected and survival struggles. But being Naruto, he'd also be curious. He might be shocked by the violence and the desolate nature of the world in the fanfiction. He'd likely try to find some way to bring hope to the characters, like he always does in his own world.
The Last of Us was not a comic originally. It was first developed as a video game, which gained significant popularity and later inspired other related media, but the comic came later.