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There are no pros. The cons are people will not read them more than once, so your story becomes confusing, and they will stop reading altogether. They may sound exotic to begin or appearing once or...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/36421 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/36421 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There are no pros. The cons are people will not read them more than once, so your story becomes confusing, and they will stop reading altogether. They may sound exotic to begin or appearing once or twice in a book, but if they are not replaced by nicknames of 2 or 3 syllables, I think people will just put your book down, it gets tiring to skip over gibberish and look for where normal text starts again. The first responsibility of a writer is to entertain, this is not entertaining.