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"Had I been on Pandora instead of Jake Sully, I would have done things differently. First of all, my legs work. Secondly, I would have seduced Princess Neytiri earlier on; it wouldn't take two hours of film for us to consummate. And thirdly, the movie would have had a good ending (the film's biggest flaw). Had I been among the Na'vi people, we would have gotten the Unobtainium — all of it."
In Fan Fiction, it's very common for favoritism to show up. After all, everybody has their preferences and regardless of their role in the story, it's never a uniform thing. However, one frequent thing is for the author of a particular fanfic to appropriate a character. Rather than creating an original character, this author will overhaul the role, importance and personality of a particular canon character they like in order to make the character "ideal" (i.e., a stereotypical Mary Sue).
Every canon character in fanfiction represents the fan's re-interpretation of that character. They aren't the original author, so they don't have first-hand knowledge of the inner mechanics beyond what is shown in the released materials. The most they can do is try their best to emulate that character using the information they have, with varying levels of success. This trope refers to the more extreme situation, when a character's most basic, undeniable traits are flat out ignored in favor of the author's own views and/or desires. For example, a fanfic of a Harem Anime that takes the Shrinking Violet character and has her all of the sudden grow a backbone and force her way into being the official romantic interest of the hero would definitely be a case of this trope. In short, it's as if a spirit (the author) possessed their bodies and took over.
Usually, it's secondary characters that get this treatment, but it's not unheard of for main characters as well. For example, if a fanfic of Inspector Gadget has the title character all of a sudden gain a near-omniscient level of detective expertise (hell, even just half-decent detective skills) and singlehandedly expose and arrest all of Dr. Claw's organization, without this being somehow subverted at the end and/or played for laughs, that would definitely be a case of this.
The traits that mark a Possession Sue are just as myriad as the ones that mark a regular old Mary Sue. As a general trend, authors that make these characters also tend to strip away much of the original characterization in the process of "idealizing" their favorite character. They might be made uber-competent, turn out to be extremely beautiful after all, outshine every other character, gain new and previously unknown powers, have a revelation of being someone's long-lost child and what have you from the Common Mary Sue Traits. Most importantly, though, is that the character is favored by the author to such a point that the same Mary Sue favoritism present in other characters and the universe come up.
As far as the Mary Sue subtypes go, any of them can apply, but the single most common is Fixer Sue. After all, the author is pretty much applying their own viewpoint on how the canon should go and hijacking a character to "fix" it is probably the single biggest inspiration for rewriting a character. Otherwise, the author might just be trying to avoid the stigma of original characters while still wanting a mask to wear as they insert themselves within the story.
Compare with the OC Stand In, which is not necessarily a Sue, but does share the characteristic of being a canon character — in this case, an underdeveloped Flat Character — overhauled to an author's liking.
Contrast Copy Cat Sue, which, rather than stripping the characterization of a canon character to make them "more appealing", instead synthesizes a blatant clone of a canon character.
No examples, please. This only defines the term.