Alternate Universe

An alternate universe fanfiction is a fanfiction written with the characters of a series, but the canon plot is dropped in favour of a new plot devised by the author. Common examples of alternate universe plots are-

-Placing the cast of the series as students in a North American high school. Complicated love triangles tend to ensue.

-Changing canon events, ie: killing off a character, bringing one back to life or changing an event so they never died, and then writing the story in a different direction.

-Replacing the cast of one series with another (see also: crossover)