As in Saseko Madobe, Nisen Madobe and etc. That's wrong.
Madobe girls and futaba OS-tans are not related in the slightest! Wouldn't be more logical to call them Futabas?
The Madobe personifications are arguably the most visible manifestation of the OS girl phenomena, so people are applying concepts related to them to earlier OS personifications (OS-tans).
Not saying it's right (I disagree with it) but I understand why it's happening.
Not to mention that the Futaba OS-tans have a fairly loose canon beyond core physical and personality traits, so people will apply whatever additional traits they want as headcanon/fanon.
(Btw, welcome & feel free to introduce yourself in the new member thread!)
It's the stupidest thing ever and I hate when it happens
I guess it's because they see characters like Madobe Nanami, Madobe Yuu. So they assume the full names of the futaba OS-tans sounds something like this as well.
It's kinda sad because that means characters like Madobe Goichi and other characters from the Madobe Family tree gets forgotten cause people assume that Madobe OS-tans and Futaba OS-tans are related to each other :(
I think it would be awesome if people would make their own designs of Madobe OS-tans that doesn't have them, like Madobe Mikaho, Madobe Sango etc. (Those are actual Madobe OS-tans mentioned in the Madobe Family tree: https://moeverse.xyz/wiki/File:%E5%AE%B6%E7%B3%BB%E5%9B%B3_Translated.png