For Allen Walker, he could have a costume that still incorporates his red - haired Innocence. Maybe a dark cloak with red accents to represent the Innocence, and some fake chains to symbolize his past as an Akuma - slayer. Lavi could have a costume based on his Bookman identity, with a large book - like backpack and some old - fashioned glasses. Kanda could be a samurai - like figure, with a traditional Japanese armor but with some spooky touches like blood - red markings on it.
One idea could be the exorcists having to deal with Akuma during a Halloween - themed mission. Maybe the Akuma are disguised as typical Halloween creatures like vampires or werewolves, adding an extra layer of confusion. Another plot could involve Allen Walker stumbling upon a town where a dark magic related to Halloween is causing chaos, and he has to figure out how to stop it while also dealing with his own inner demons.
Definitely. It should be a continuation. Since there are still so many loose ends in the original story, like the full story behind Allen's transformation and the ultimate fate of the Black Order. 'D Gray - Man Remaining Story' will most likely carry on the story to answer these questions.
In D.Gray - Man fanfics, amnesia can be portrayed in various ways. Sometimes it's used as a plot device to create mystery. For example, a character might forget their past and their powers, leading other characters to search for the cause. This can add an element of suspense to the story.
One idea could be a story where Mana and the Earl have to team up against a common enemy that threatens their existence in ways they haven't faced before. This would force them to put aside their differences and use their combined powers.
In some fanfics, Allen might be depicted as dead, but it really depends on the specific plot and the author's creativity. Fanfic writers often take liberties with the original story, so there could be various interpretations.
The D'Gray Man manga has indeed finished. It wrapped up with a satisfying ending that tied up most of the plotlines and left a lasting impression on readers.