Enid is indeed alive. The storylines haven't depicted her demise yet. Usually, characters' fates change based on the plot developments, but so far, she's still part of the comic world.
The relationship could be developed through shared experiences. For example, they could fight side by side against a common enemy, which builds trust. Then, small moments of kindness, like Carl sharing his food with Enid or Enid patching up Carl's wounds, can deepen their emotional bond. Eventually, this leads to their physical relationship as their feelings reach a boiling point.
Another theme is mystery - solving. Since Wednesday has a penchant for the macabre and Enid is always up for an adventure, fanfictions often put them in situations where they have to solve a mystery. It could be something related to the school's dark secrets or a strange occurrence in the town.
I also like 'The Midnight Adventure'. It's a story where Wednesday and Enid embark on an unexpected adventure in the middle of the night. The descriptions of their emotions and interactions are really vivid, and it gives a fresh perspective on their bond outside of the usual school setting.