Some fanfictions also focus on their individual growth within the relationship. For example, Henry might learn to be more assertive from Enid, and Enid might learn to trust more from Henry. This mutual growth is an interesting aspect that many fanfiction writers like to explore.
You can try some popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just search for 'the walking dead henry x enid' on their search bars, and you should be able to find relevant fanfictions.
A Naruto x Enid 'The Walking Dead' fanfiction could be full of action and character development. Naruto's optimism would be a shock to Enid who has seen so much despair. He might help her open up more. For example, Naruto could use his shadow clone jutsu to distract walkers while Enid scavenges for supplies. And Enid could teach Naruto about the unwritten rules of survival in her world. Their relationship could grow from comrades in arms to something deeper as they face the constant threat of walkers and other survivors together.