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According to Azumanga Puzzle Bobble...it was an accurate impersonation lol
Ah, can't forget "Sacchan" - how Tomoko refers to Sachiko even as an adult. That's a cute one based on how Miko used to call Sachiko when they were in grade school/part of jr high (aka when Tomoko was growing up)
Shout-out to That Book from Nari Meta Lore, though! Just...Yomi's actually topless, and I had to cut off this hilarious bit in the main post for the sake of censorship
It started in Azu fancomics with then-fanchild Miko, but, even in Raison, the 'gray not-cat' and their name is a stealth joke to these old Azu gags