When I hear the colloquial languages they sound kind of cute to me. But that's just because I'm used to MSA. :) It's also not a misspelling issue.
As for Japanese, of course there are ways to change the spelling to sound cute. There's ra-nuki, changing vowels (especially ai -> ee) and because the language doesn't try to be subtle, there are words to add onto the end of the sentence to perfunctorily make them cute (mon, wa, etc.).
I'm a bit rusty so maybe I'm not quite sure how cute any of those are, but they exist. Manga also has fun with their furigana, for example I saw a character who was portrayed as Chinese because though he was speaking Japanese, he would use characters more common to Chinese, like 我 with the reading わたし.
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As for Japanese, of course there are ways to change the spelling to sound cute. There's ra-nuki, changing vowels (especially ai -> ee) and because the language doesn't try to be subtle, there are words to add onto the end of the sentence to perfunctorily make them cute (mon, wa, etc.).
I'm a bit rusty so maybe I'm not quite sure how cute any of those are, but they exist. Manga also has fun with their furigana, for example I saw a character who was portrayed as Chinese because though he was speaking Japanese, he would use characters more common to Chinese, like 我 with the reading わたし.