Well, in Constantine fanfiction, the theme of isolation is quite prevalent. He's often alone in his battles against the supernatural, and this sense of isolation is explored in many stories. The theme of sacrifice is also common. Constantine sometimes has to sacrifice something, whether it's his relationships or his own well - being, to achieve a greater good. And then there's the theme of mystery. The world of Constantine is full of secrets, and fanfictions often dig deeper into these mysteries.
The theme of the battle between good and evil is also prevalent. Whether he's in a world full of superheroes or in a horror - inspired setting, Constantine is often at the center of the fight against evil forces. His unique approach to dealing with demons and the supernatural makes this theme play out in different and exciting ways compared to the native characters of the crossovers.
One great 'John Constantine Supernatural Fanfiction' is 'Constantine's Cursed Case'. It has a really engaging plot where Constantine teams up with the Winchester brothers in a way that feels true to the characters. The author does a wonderful job of capturing Constantine's snarky attitude and his unique brand of magic.
Well, there are many talented authors in the fanfiction community. Some of the ones known for good Zatanna and Constantine fanfiction might be those who have a deep understanding of the DC universe's magic system. They can create stories that feel true to the characters. However, it's hard to name just a few as there are so many great ones out there.
You can try searching on fanfiction platforms like Archive of Our Own (AO3). It has a vast collection of fanfics, and you might be able to find some great King Shark x Constantine ones there by simply using the search bar and typing in their names.
There's a fanfiction where John Constantine crosses over with the Supernatural universe. It's really cool because it combines the dark magic and demon - hunting aspects of both worlds. Constantine's knowledge of the occult clashes and also meshes with the Winchesters' way of dealing with the supernatural, leading to some intense and exciting storylines.
In some comic storylines, Constantine's sexuality is ambiguous or not clearly defined. It depends on the specific interpretation and version of the character.