Dark and spooky settings are common. Like old, dilapidated houses or isolated cemeteries. Another element is the presence of something unknown and menacing, such as a shadowy figure or a strange noise that can't be explained.
Yes, there might be. Fanfiction websites are filled with all kinds of creative works. You can try searching on popular fanfiction platforms like FanFiction.net or Archive of Our Own. Just type in 'Naruto is Skull de Mort' in their search bars and see what comes up.
Without having read Mort graphic novel, it's hard to say precisely. However, often main characters in graphic novels are characters that drive the action forward. They could be characters with special abilities or those in a position of power or conflict. Maybe there's a character who is on a quest, and that could be one of the main characters in this graphic novel.
One unique feature could be its art style. The illustrations in Mort graphic novel might have a distinct look that sets it apart from other graphic novels. It could have detailed character designs and unique use of color.
Hisoka fanfic often focuses on his unpredictable nature. Hisoka is a complex character, so many fanfics explore his motives and desires. For example, some fanfics might dig into why he is so obsessed with strong opponents.
Hisoka is still alive in the manga. The storylines haven't led to his death yet. Maybe there'll be developments in the future, but for now, he's kicking.