Characters who are eccentric, nutty or mentally unhinged tend to demonstrate this in everything - including language. They often invent their own words or use the existing ones in strange ways, employ peculiar syntax and grammar. From time to time, they may also use a Perfectly Cromulent Word.

Compare with Buffy Speak.


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    Comic Books 
  • Hay Lin from W.I.T.C.H. tends to use the words "spacious" and "cosmic" as synonyms for "cool", and also sometimes invents her own words like "weirdific" and "rockalicious".

  • Jeanne, Wyatt's mother from Shadow Play by Charles Baxter, makes up words like "corilineal", "zarklike", etc., and this is just one of her many peculiarities.

    Western Animation 
  • King Julien of Madagascar fame is a crazy, party-loving, self-obsessed lemur who has Malaproper tendencies.

  • Ever After High has Riddish / Riddle-ish. The rhyming language of the usually mad residents of Wonderland.
  • In the Fate series, the Mental Pollution trait is explicitly described this way. Servants with the trait cannot be understood (or influenced) by anybody who does not relate perfectly to their disturbed worldview.

    Real Life 
  • Truth in Television actually. One of the common symptoms of schizophrenia is the tendency to invent neologisms.