I don't see Heathcliff as an ISFP
I mean, he isn't a Sensing, he doesn't focus in the present, living the "here and now".
I always thought he was a lot steps ahead from the others. Always planning something to take advantage.
Why do you think he can be an ISFP? I'm just curious.
In his most natural state (as he was in his youth)- he did live in the moment. It was
just him and Cathy, running around like wild things. He made decisions based on
how he felt in a split second, often getting himself into more trouble than he
was already in. Though he seems to think this trouble is worth it, every time.
This screams Fi to me, because he fights instinctively, immediately according
to his own, extremely individualized internal sense of right and wrong.
He seems predominantly Fi to me throughout the whole book. This is because
he never stops for a second to judge everything and everyone around him
according to his own set of values, no matter what trouble it may cause him
or anyone else, no matter what anyone thinks or says.
Mainly he thinks love for Cathy = right. Anything or anyone that tries to get in
the way of that= wrong. No logic or compromise involved. Just pure personal value.
It seems to me that he becomes an intricate and obsessive planner only
after he overhears Cathy talking about marrying Edgar, because of
Heathcliff's low station. It is not his natural state of being, but something
he learns in order to satisfy his need for revenge (which also strikes me
as very Fi).
S and N do not denote not planning and planning to me, anyhow.
I associate P and J with that. And even then, only in that P
prefers to improvise and J prefers to plan (not that P doesn't
or can't plan and/or that J doesn't or can't improvise).
Everybody plans, and everybody improvises. People are just usually
a bit more satisfied by one a bit more over the other. Heathcliff strikes
me as being more satisfied with improvising, even though he makes
one damn good planner.
So to explain why he strikes me as an S instead of
an N: he is very coordinated, athletic. He seems in tune with his
surroundings, very earthy, a nature lover. He is ready for
most anything and responds quickly to outside stimuli. He easily
intimidates others with a sense of physical 'presence' (this is a trait
I often associate with Se).
More reasons for S: He also seems to have a natural knack for
'street smarts'. He easily notices the opportunity in the mundane
details and/or depressing realities of life that others' do not notice
as quickly or would prefer not to think about, as they are thinking
about other, perhaps more interesting, but less realistic things.
This is one of his main sources of power over others' in the
book. He easily exploits the property laws and others'
humanity due to this characteristic.