Revy isfp enneagram 8 fi is apparent when rocky and her were in huge argument and she stated that you do not know
You are correct in saying xSFP, but she certainly is no ISFP. Her primary function is undoubtedly Se. She does have quite a bit of Fi, just because she can be cold doesn't mean she doesn't feel, she has a lot of internalised and complex feelings stemming from her traumatic early life. She seems to get a lot of Fi when killing, it gives her a sense of euphoria, empowerment, and satisfaction. She is very trigger happy and will often want to kill just for the fun of it, leading to Dutch holding her back a few times. She can be rash in her decision making, going for heat rather than cool planing.
My thoughts on her being esfp makes way more sense than her being tp at all.
I have seem her typed as a entp and if I was to go by quadras, she would still be sf gamma because there is going to be a dark quality about her unless she is a nine, six, ir three.
If you want to have an idea of a tp wouls be Patrick Bateman because the way he was analyzing the situation using a chainsaw on "the girl is se ti.