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I don't see anything wrong in using hahaha as long as it's surrounded with a quote. I mean, I believe a character's style of laughter can be represented by a quoted word like "hahaha" or even "buha...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/45275 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I don't see anything wrong in using _hahaha_ as long as it's surrounded with a quote. I mean, I believe a character's style of laughter can be represented by a quoted word like "hahaha" or even "buhahaha". The key pointer here is to surround it by quotes so that the reader knows what's going on.