Yeah I'd say that Higurashi characters aren't considered this due to reasons. Also a reminder to people who haven't been paying attention watch the new branch of Higurashi: Higurashi no Naku Koro ni Outbreak.
I think they'd be considered yangire since their psychotic actions do not stem from romance. Their expressions are just interchangeable with yanderes because that's where you most see faces like that
Thanks for the explanation and rec. I don't think I've seen additional Higurashi series other than the original. I really should catch up even though I'm kind of aware of the entire plotline somewhat.