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A character replacement, also known as an Impostor!Sue, a Replacement!Sue, or a Doppelgänger!Sue, is what you have when a canon character is so badly out of character that mere possession or Suefluence no longer explains their behavior. When a character comes close to or reaches 100% OOC, they split into two characters: one character replacement, and one canon character. The canon falls or is forced into a plothole; the replacement takes over the character's role.

Symptoms[]

A character replacement happens when everything that makes the canon character who they are is tossed out the window while the story continues to insist they're the same person. As in cases of possession, the character will exhibit sudden, unexplained, severe changes in appearance and/or behavior: a canonically kindhearted character may abruptly develop a temper and turn on her friends and family; a canonically cruel or capricious character may act like a woobie who weeps at the thought of his loved ones. The greater the alteration from canon and the poorer the explanation for the changes, the more likely it is that the character has been replaced.

Diagnosis[]

The signs of a character replacement are very similar to those of possession by a Sue-wraith. Since mistaking a case of possession for a replacement can result in the unjust slaying of canon character who only needs to be exorcised, it is important to observe the character closely for a period of time to determine which is the case.

As Trojie explains in her Slash-Sporking Guide, there are a few indicators to suggest that a character has been replaced rather than possessed:

A name-change usually denotes a replacement. As does a complete moral transplant: for instance, Harry Potter driven by guilt and ANGST to wander around killing Death Eaters and capslocking about it is probably possessed; Harry Potter killing Death Eaters for fun and profit and not angsting OR capslocking about it is mostly likely a replacement. Dark! versions of heroes and good! or conflicted! versions of villains are not necessarily replacements — the key is to read how the author has justified it. If they've genuinely been extrapolating from canonical clues, hints and behaviours, then it's probably a case of possession. If they've completely changed the character's motivations, then you're most likely dealing with a replacement.

A Canon Analysis Device or Character Analysis Device will identify character replacements not as OOC, but as non-canon, Mary Sues, and/or character replacements.

Treatment[]

Character replacement Sues can be charged, assassinated, and disposed of, just like original character Sues. Some variation on "impersonating a canon character" is added to the charge list.

However, not all character replacements are Sues. Some may be removed from the continuum by means of recruitment.

When a character is replaced, the original is locked up in a plothole to prevent them from interfering with the fic. The duty of the agents is then to find the original and free them. Kidnapped canons can often be found in canonical prisons or other hard-to-escape places. They may require neuralyzation and/or a trip to the Department of Fictional Psychology, depending on what they may have seen or experienced.

A problem arises with Stus that try to impersonate Captain Jack Harkness. Jack can't stay dead, and for some reason his impostors have this characteristic, too. On their one encounter with an Impostor!Jack, Agents Emma and Tasmin decided to dispose of the impostor by taking him into Greek mythology and chaining him up next to Tantalos. A later Jack Harkness replacement escaped a similar fate by being recruited, and became Jacques Bonnefoy. With the release of Torchwood's fourth season, it is possible that unrecruitable replacements could be taken into Miracle Day and killed there.

Examples[]

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