First I’ve heard “yumeship”. www.urbandictionary.com/define.php?term=yumeship

A yumeshipper - or a Yume - is someone that cherishes and loves a fictional character so deeply, they see themselves with that character.

“Yume” means “dream” in Japanese.

“F/O” apparently means “Fictional Other”.

I’m not sure if they understand the difference between real people, fictional characters, and chatbots.