How often do the special characters appear?

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In the game Fingered, special characters can appear occasionally among the regular characters that can unlock an achievement if they have been executed (even if it's the wrong person, which most of the time seems to be the case). There's even a Steam guide outlining each of the characters.
But, I'm confused about when or how they appear. Is it usually at random, or are there any criteria to be met in order to encounter them? If it is random, how often?
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Is there a special visitor everyday ACNH?
Daisy Mae will always visit your island every Sunday morning to sell her turnips and will leave at 12pm. Meanwhile, you have to unlock K.K. Slider by completing the main storyline of the game and then he will visit every Saturday or Sunday if an event intervenes.What days do characters visit Animal Crossing?
Apparently, Animal Crossing: New Horizons players are guaranteed to be visited by Kicks, Leif, and Saharah on one of three weekdays (Monday - Friday). The other two days are reserved for CJ, Gulliver, Flick, Label, and Redd.How many animal crossing special characters are there?
From friendly faces to suspicious swindlers, meet all the Special Characters in Animal Crossing: New Horizons! Learn where you can find each of the 36 Characters on your island and visitors! You can also find the three new characters from the Happy Home Paradise DLC!What are the most common special characters?
Password Special CharactersCharacterNameUnicode!ExclamationU+0021\u201dDouble quoteU+0022#Number sign (hash)U+0023$Dollar signU+002429 more rowshow to solve keyboard special character typing problem
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