So is Elloge's fetich soul the dreaded Ma'lisu, The End Sign?
No, probably not - at least by the way that I write Third Circles.
See, my head rules for how to write Third Circles is that a Third Circle is at once an Intimacy, a means and method by which the Yozi interacts with the world, and a statement about the Yozi and its aesthetics/themes in question.
Take the Shashalme. For Metagaos, they are:
Intimacy: Lazy Egotism (Myself)
Means/Method: Mind-enslaving infection
Statement: Fruit exists to trick birds into spreading seeds.
Out of that, you get a decadent jungle demon prince that loves being adored, believes that Metagaos came into being so that it might exist, and gives you gifts so you're in its debt and while you're in its debt, you find yourself adoring it. Which means the people it gives gifts to either repay it or become its slaves. And the Shashalme is beautiful and brightly coloured and lazes around in overgrown ruins, trading favours and debts and giving people gold (which means almost nothing to it but is pretty and shiny). The Shashalme is built to be a dangerous corruptive antagonist for Sidereals and other Celestials, because it's the classic "Greed" based demon in how it bribes people and how its cultists are always rich and the more they accept from it, the deeper in its debt they get and the more they adore it. It's also built to be a fairly tolerable patron for Infernals, who can use it as a source of Backgrounds but who have to always be careful to keep on top of how much they owe it and try to be proactive and do things for it so it'll reward you - because it finds being in anyone's debt to be physically painful.
Using the same thing, we can reverse-engineer Ligier into the same set of statements:
What is he? He holds Malfeas in contempt, he cuts Malfeas up and makes things from harming his greater self, he's linked to the GSNF tree and Sun Heart Furnace Soul. So we can get a similar set of statements akin to:
Intimacy: Self-hatred (Myself)
Means/Method: Overwhelming power (Sun Heart Furnace Soul, GSNF tree)
Statement: Suns are radioactive things that make dense elements out of lighter ones.
And as Malfeas' heart, his Intimacy is probably the most critical part of Malfeas. He hates himself. Malfeas hates everything, but most of all he hates himself. That's the core of him.
Same for Iudicavisse, my fan-written fetich for Cecelyne, who's built from that idea of a reverse engineered Malfeas-Ligier link, used to create the fetich for my interpretation of Cecelyne. She is as follows:
Intimacy: Power Is the Only Thing That Matters (Bleak Acceptance)
Means/Method: Making arbitrary rules
Statement: All systems will tend towards having the goal of furthering themselves.
And that's why she's an archer-princess who literally uses law as a weapon and who has the end goal of enslaving the other Yozis with a second Surrender Oath so they have to do whatever arbitrary thing she says. She's the core of Cecelyne, stripped of any other ideas of how the world could be better or the ideas of perfect justice she held before the Primordial War. Back before the war, she truly wanted to use the law to make a perfect fair system (from within her frame of references), but now those souls are dead and when it comes down to it, the purpose of power for a system such as her is more power. Cecelyne's fetich is not depressed even if the greater Cecelyne is, because the greater Cecelyne is the expression of the interaction of her other souls. Cecelyne's fetich says, "Do what I say shall be the whole of the law" and loves it.
So Elloge's fetich? It's going to be the fundamental thing Elloge uses to interact with the world, and that - at least as I see it from Revlid's version - is rejecting it. Elloge would love to be a Mary Sue, something perfect and narrative warping that makes the world revolve around her - but in her heart of hearts, she's not. She's symbolicly someone hurt and traumatised just as much as Adorjan is, and just as Adorjan runs from her issues, Elloge tries to escape from them in a way where she can't be hurt by things which don't matter and she can control everything.
Hence, yes,
@The Sandman is probably right to bring up the idea of a PMMM witch. Elloge's fetich is probably going to be something that hides in a fantasy world, and which snatches up other demons and strips them down to narrative simplicity, so it knows everything about them and uses them to populate its world. The other souls are the tools for interacting with the outside world - the "Take ideas from everyone else and make them your own" and "Twist other beings into being a lesser part of your existence". They're her scrabbling attempts to handle a world that hurts and terrifies her. Elloge's fetich is the core of that cluster, a terrified thing that hides in fantasy and denies that the outside world even exists.
Or maybe not. I can hardly speak authoritatively here. Just really throwing ideas out at this point.