While relationships are the sort of thing I don't always think about, this RP does seem like the sort where establishing how the characters already know each other would be important.  They're already classmates, and not complete strangers, and all.  

I do think Honoka would be quite impressed by Kaguya's quirk, because it's really cool just by default.  And she's the sort to get excited about that sort of thing.  I'm not sure how much of a mecha fan Honoka is, but I definitely get the references and that's pretty fun, too.