No one finds me friendly or approachable or emotionally open in person. People nag at me to smile, complain they cannot tell how I feel, project stuff onto me, etc. I do get strangers making emotional confessions to me, but that is at odds with how I am perceived socially.
This is almost entirely a 9 vs 4 enneagram thing for INFPs. The 9 INFPs I know do have a much more approachable, relaxed, friendly aura and they more readily express positive emotion. They don't use emotional expression so much as a TOOL, however, which does seem more Fe over all, but they do not come across as blank or cold.
I honestly do use emotional expression as a tool, but it's crappy "faux Fe" I put on to avoid being stigmatized so much for not being a typical gushy girl. However, when I do have genuinely strong emotion and a suitable context/reason to express it, then I'm more passionate and intense than my e9 friends. I may keep this at bay because it's not the easy warmth of the e9 and it can be disturbing to people.
INFJs seem more controlled, even if they become very expressive. It all seems "calculated". Being Ni-dom, they can seem expressionless & not extremely emotive too, which I think is more introversion than anything. Te-dom seem highly expressive & animated to me, as do all extroverts, so I think that has way less to do with Feeling than Extroversion.
Anyway, on-topic: I don't like this author or the fantasy genre in general. I think the fantasy genre is mistakenly associated with iNtuition, when fantasy itself is not iNtuition in the Jungian sense. So much in the fantasy genre is very straight-forward story-telling (fantastical elements, but lacking in real symbolism and developed themes, so that it's just action & plot in a whimsical setting), which is always how this author has struck me, although I am admittedly not well-acquainted with her books because their very concept doesn't interest me.