From her description, yes. It’s not explicitly said, because they don’t remember what an English native speaker is, but she is.
That’s not what I meant. I’m talking specifically about the case where a foreigner makes strange mistakes.
I tried to go down the rabbit hole of TV tropes to find the trope name, and found that Yume’s case is https://tvtropes.org/pmwiki/pmwiki.php/Main/Malaproper instead, but couldn’t find the one I wanted 
I am fine with Yume’s case by the way.
Actually, case in point, Yume making that mistake would be fine (I can believe she heard ドテカボチャ at some point in her life and is mixing things up), but not the foreigner with low to mid fluency (who magically understands everything everyone else is saying… but at the same time she has been in a Japanese only environment for a while, so I’m okay with that one).
I was more thinking about the fact that they don’t know anything about each other, but that’s part of it.
He is much more grounded. Doesn’t panic, just get the job done, that kind of thing.
I still wish he would talk more to people. There are a few times when he has potential advices for others but keep them to himself because “it’s not his place” to comment on their stuff.
That would be throwing them away, I guess. The ones I have, I got for ~30 yen. I don’t think any place in Japan would take them back. From experience, selling back stuff from the 110 jpy bin is usually thrown away too (in which case I get 0 yen, but that doesn’t really matter, even if it’s fine I only get ~10 yen; I don’t like the idea of books being thrown away).
I could try to give them to my local library 
They do not have that series.
