So, I just did a 5 core thingy and went to the experimentation mode after looking for a reverted perspective of Socionics.
And I don't know whether if someone has done it before but if there really is any, you could tell me.
What I did was simply highlighting atomic elements in a periodic table as the picture below:
If you want to know how I made it make sense, you could search each of element on the internet, especially the search engine and you'd find it. And to be honest, not being surprised, but I somewhat have figured it long before I searched the definition of each "element" to match my own perspective of function. And what intrigued me is that, the characteristics of each element that is somewhat similar akin to the IMEs.
And by this, I have made a conclusion that I could categorize Fi as a function that has "the outside realm" of metabolism akin to others since, in my opinion, I would say it has no specific correlation towards the ethical attitude yet rather oriented by the relation on itself, or in the other words, we could call it as the "Corrector" of IMEs or a part of completion to correct the elementary application of IMEs in general.
Ne = Neon
Ni = Nickel
Pure nickel, powdered to maximize the reactive surface area, shows a significant chemical activity, but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion (passivation)
Fe = Iron.
Reactive but not toxic, cellular respiration and oxidation fits Fe too and perhaps coordination compound, rust occupying and flaking off new exposure fits too considering the dynamic nature to it and it returning back for search of new emotional expression and orienting itself based on interplay of signals of others elements