Fanfiction is the majority action in fandom. Fanfiction writers work with their favorite characters. Character analysis of fan is different with the one of common people. Fan works have different standards, so that makes misunderstanding comparing with common literature. This study subscribes about the standards and the analysis ability of fans. This study is based on Korean The X-Files fanfictions, which has database from 1990s to 2000s. The category of fanfiction is close to ``tag``. Tag is the guideline of fanfiction writers and readers. For example: Shipper. Relationship is important to fanfiction and it gives a lot of categories: shipper, fence sitter, slash, and etc. And in fictional fanworks, timeline is important to determine character`s mind. The modern literature characters isn`t flat: their mind is original, but actions are various. So fans describe a character in many ways, but they know the character should do something based on canon. Vladimir Propp talks about functions of characters in Morphology of the Folk Tale. The X-Files characters are set in Propp`s Morphology: villian-smoking man, helper-The Lone Gunmen, Princess` Father-Skinner, hero-Mulder and Scully, false hero-Krycek, etc. Absentation-kidnapping of Samantha, interdiction-the classify of case, violation of interdiction-Mulder`s investigation, etc. This makes alternative universe fanfiction: the characters are same but the background(place, time) is different. In even canon, 6X03 Triangle showed alternative universe in world war II, and 7ABX18 Hollywood A.D. showed it with ``feature film`` as a fiction in a fiction. Fans also know the functions of characters, and apply to their works. But, fans choose the one side of peculiarities in canon. Each of fan wants to see what he or she likes(or should be): someone chooses Mulder`s braveness, but another chooses his ditching to Scully, and another choose his laziness to write on their story. Fan are curious about the characters, and further they imagine what the character would do. The fanfictions are fan`s analysis of characters. Fanfiction is a kind of guideline. A canon which has a lot of fanfictions means that the accepters(reader/viewer/audience) of this work are active, and the canon has a value of poaching.