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Liminal Being
"Then I shan"t be exactly a human?" Peter asked.
"Nor exactly a bird?"
"What shall I be?"
"You will be a Betwixt-and-Between," Solomon said, and certainly he was a wise old fellow, for that is exactly how it turned out.
J. M. Barrie, Peter Pan in Kensington Gardens

Some creatures are not exactly a thing, because they partake of the natures of two different things. The term for this is "liminality", from the Latin limen or threshold, and beings who remain perpetually on this threshold are mysterious, uncanny, eerie beings — if the artist uses them for their full potential. They can also appear just for the Rule of Cool (but beware the dangers of Ninja Pirate Zombie Robot). This makes this a Super Trope of many, many, many tropes.

Shapeshifting or other changes into and out of determinate states is still liminal if the transition keeps happening, or if the time in the other state confers a permanent change in the character.

Transitioning out of being a liminal being is difficult if even possible. See the Liminal Time YKTTW for when transition is normal.

Tropes of liminal beings

Liminal beings that fall between the tropes

Anime & Manga
  • Schrodinger in Hellsing, a catboy who, due to being a result of a Nazi experiment, has a loose grasp of causality; he both exists and does not exist.

Fairy Tales
  • In the French tale "The Valley of Damned", the character the couple meet on the borders of the valley is dressed half for town and half for country.

  • Tiresias, when Odysseus consults him in the underworld, manages to hit a trifecta of liminality:
    • A ghost, both alive and dead
    • A blind seer, both less and more than human in his abilities, and
    • Having been transformed into woman and back while alive, both male and female.
  • Tobias from Animorphs, with his human and hawk dual natures, plus his Andalite heritage.
  • The "scramble suits" worn by drug enforcement agents in A Scanner Darkly were thin membranes projecting constantly-shifting images of different physical and facial features over the bodies of the wearers, to provide anonymity.
  • In Katherine Addison's The Goblin Emperor, a woman had been formally betrothed to a prince when he died, but not actually married him; this detached her from her own family without incorporating her into his. Maia contemplates her status as this, and there are suggestions that she could become a votary (dedicate herself to a god) as the simplest way to handle her situation.
  • In Madeleine L'Engle's A Wrinkle in Time, when Calvin and Charles Wallace first meet, Charles Wallace explains that Meg has it tough because she's not really one thing or another — she's not a glamorous and collected scientist like her mother, and she's not one of the cool, popular girls at school.
  • In A Discovery of Witches, it turns out that Diana Bishop is a being of opposites in several ways — thanks to Vanishing Twin Syndrome, she's a genetic chimera with DNA of her unborn twin brother. She then saves Matthew's life by giving him some of her blood, and patches of her body turn cold, like a vampire's. In the second book, it turns out she is a weaver (capable of using all paths of witchcraft, but never mastering them), with an affinity for fire and water, and capable of standing between the realms of life and death, and past and future. In the third book, it's revealed that weavers themselves are the result of daemon and witch DNA mingling — and Diana merges with the Book of Life, to become a book and a woman, the history of the four races and the hope for their future. Phew!
  • In Ursula K Leguin's The Farthest Shore, they find that someone is offering that one can escape both life and death. In the end, he claims to be between both and so free of them.

Live-Action TV
  • Torchwood had Owen, who died and Came Back Wrong. He wasn't really alive or dead, so he couldn't be killed, couldn't heal from injuries, eat, etc etc

  • In one of Aesop's Fables, a bat tries to ally with both beasts and birds, trading on its similarity to both and disavowing the other traits according to whom it's addressing, but after the war, they unify in rejecting it from both groups.
  • In Indian myth, Vishnu became a half-man, half-lion in order to deal with a demon that could not been killed by an animal, a man, or a god, neither by night nor by day. (He also did it at sundown.)

Visual Novel
  • Ciel from Tsukihime is stuck between life and death, due to not having died after the Big Bad possessed and left her body, like all his previous victims did.

  • In Gunnerkrigg Court, when Annie and Kat ask Jones whether Zimmy is human, Jones says, not that she is or she isn't, but that she is for all practical purposes. She is in many respects more uncanny and creepy than many of the overtly non-human people about.
  • In Bird Boy, the woods, which are actually called the liminal woods.

Western Animation
  • Balto has it verbalized by Boris about the title character. "Not a dog, not a wolf...all he knows is what he is not."

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alternative title(s): In Between Being
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