I recently encountered the suffix っちょ after a noun in a manga. According to Jisho, it is a suffix used after a noun or the root of an adjective and which means "person who is/thing that is".
Since it is the first time I encounter this suffix, I would like to know how common it is and what kind of nuance it adds. How formal is it? Also, is it regional or used everywhere in Japan? Thank you!