[[quoteright:355:[[http://web.archive.org/web/20130113015345/http://piratemonkeysinc.com/ms1.htm http://static.tvtropes.org/pmwiki/pub/images/sparklypoo.jpg]]]]
[[caption-width-right:350:[[ThereCanBeOnlyOne What]] ''[[ThereCanBeOnlyOne should]]'' [[ThereCanBeOnlyOne happen when one of these occurs.]][[note]][[Main/UltimateShowdownOfUltimateDestiny And then the last one commits seppuku. Yay!]][[/note]]]]

->'''Meji''': …so… um… you're Jon's long lost, estranged sister, who's been turned into an emotionless magic Ninja assassin by some secret order of monks hidden in the mountains? That's like, really, kinda freaking stupid if you don't mind me saying. And I thought your brother's whole "hitman with a troubled past and a heart of gold" bit was bad.\\
'''Ellis''': Yeah, and this is coming from a magic-using, half elven heiress with unusual hair and eye colors, and talking animal companion. So that's really saying something there.
-->-- ''Webcomic/ErrantStory''

MarySue [[IAmLegion is legion, for she is many]]. [[MarySueTropes She has many forms]], each more terrible than the one before. And she ''breeds''.

Some authors, through either myopia, self-absorption, or the fact that they're writing the story [[SelfInsertFic with or for a group of their friends]], don't stop at just one. They [[GottaCatchThemAll pile the Sue on]]. "Let's see, PuritySue for the heroine, of course. Plus a RelationshipSue for her love interest. VillainSue pitted against her, because my villain should be cool, too. Wait, people might think this is stereotypical, let's put her friend AntiSue in there to show everyone I'm a serious author. And hey, while I'm at it, why don't I make the [[EnsembleDarkhorse Ensemble Darkhorses]] the heroine's [[PossessionSue best friends?]] They are ''so'' underrated… and they can all have adventures in my MarySuetopia!"

And then there are authors who don't want anyone stealing the limelight from [[AuthorAvatar the surrogate]], so they pile ''every single Sue trait'' onto one character, creating a sort of… ''[[HiveMind Hive Sue]]''. On the other hand, authors that are slightly more [[GenreSavvy fandom-savvy]] may forgo making original Sues and turn all their favorite canon characters into {{Possession Sue}}s instead in order to fall under the MarySueHunter radar.

ParodySue is usually this done deliberately, although [[PoesLaw it can become hard to tell it was supposed to be a joke]]. Parodies of multiple types of Sue tend to turn into a bloodbath (see page picture), as [[BlackHoleSue there's usually only room for one]].

And the above example raises a kind of interesting question: When ''everyone'' is a MarySue, [[FridgeLogic would they cancel each other out]]? [[RealityBreakingParadox Or would the universe implode]]? The idea that they cancel each other out and keep the setting in conflict is one of the major rationales behind this trope. After all, fantasy settings, polytheistic settings involving any {{God}}s, and ComicBooks can get away with nigh-omnipotent characters fighting each other and creating conflict without the readers calling out the characters as {{Canon Sue}}s.

'''No examples, please. This just defines the trope'''.