At the highest level, the cosmology of the FineVerse is actually very simple: it's all a story being told by the Narrator, Pashen, based on the fundamental principles of the same name: Pashen. Note, though, that this is not merely a reflection of the truth (that this is fiction). The FineVerse is a collaborative project, but the lore only mentions Pashen, not numerous authors. 

Within this narrative told by Pashen, there exists a clear structure and cosmology which is worth understanding and discussing, even if technically subject to change at Pashen's whim.

The first and most directly related to Pashen is Squishy. Squishy is a 'pataphysical' entity commonly portrayed as a pink, cartoon octopus. He holds seemingly unlimited narrative power, and often refers to Pashen as his 'dad', and seems to consider Pashen the only entity above him. In that sense, Squishy ranks second in the hierarchy. Generally, it's implied that Squishy is actually a portion of Pashen: that being 'writer's block,' which Squishy claims he literally embodies. Squishy is often the one associated with a narrative being abandoned or destroyed, as well as the confidence to write a story even if Pashen fears it won't be good, original, or well-received. In contrast, Pashen is of course then associated with a narrative being created in the first place. Squishy also has an alter-ego named Ms. Y, which seems to just be a feminine version of himself with some differences in personality, though he claims Ms. Y is actually his girlfriend and a distinct entity- though they are never actually seen together at the same time.

Tied for the next fourteen places in the known hierarchy are the Sins and Virtues. Created by Squishy, they're not actually that prevalent in the story, but they are technically far above the more important Old Gods which come after them. Each one, obviously, embodies a particular sin or virtue and controls a sphere of influence where they collect mortal souls in a sort of afterlife. Every single one used to be a mortal soul which somehow ascended to this position, likely due to Squishy's involvement. Specifically, they're stated to be 7th dimensional, the significance of which will be elaborated upon later.

Unlike the previous two parts of the hierarchy, the Old Gods, or often just referred to as 'Gods' with a capital 'G', are a common and prevalent part of the overall narrative of the FineVerse, having pivotal roles in many universes and being responsible for most of the relevant cosmology. There are four of them. In short, they're the original four Gods who created the universe.

• The Plasma Magpie: More commonly known as Anu, God of Creation, or God of Something. Originally, they were a normal magpie in 'real life', but died and achieved Pashen, allowing them to create the entire universe in which most of the FineVerse takes place. They did so by sharing their stories with the Tree of Shadows, who let them perch upon its branches. They faded away as they told these stories until they were spread across all of creation, leaving only two eggs behind.

• The Tree of Shadows: More commonly known as the Great Succubus of the Void, God of Nothing. After the Plasma Magpie achieved Pashen, it allowed them to perch upon its branches, for which the Magpie was grateful, and shared their stories with the Tree. The Tree was no longer alone for the first time, and soon considered the Magpie its sibling. It was deeply sad when the Magpie faded away, swearing to take care of their eggs, but its roots grew bitter and cold. Its branches felt heavy from the weight. The shadows grew darker and deeper. Every day, the Tree of Shadows would torture itself with loss. A fading memory, a forgotten hope, a venomous regret. Every day, the Tree would tell itself that the Magpie would be proud of them, but it was lying. In every curiosity, sentiment, and memory, it saw only that it was a disappointment. The tree held the Clockwork Butterfly and the Obsidian Lion in its leaves and branches. It provided sanctuary, and it taught them everything it knew. Yet it didn't feel like love- it felt like burden, like obligation.

• The Obsidian Lion: More commonly known as Alhukm, God of Power and Purpose, or God of Order. He hatched alongside his sister, the Clockwork Butterfly at the start of time. Every night, the Obsidian Lion would come to the Tree with a new sentiment. A profound revelation, a brilliant epiphany, an ingenious art piece. Using mere scraps of the Magpie, the Lion satiated endless emotion with infinite expression. Every evening, the Tree would tell the Lion it was proud of them, but it was lying. In every ideology, fable, and philosophy, it only saw the faint whispers of the Magpie's stories, and reminders of what it had lost.

• The Clockwork Butterfly: More commonly known as Albundir, God of Pleasure and Purpose, or God of Chaos. She hatched alongside her brother, the Obsidian Lion at the start of time. Every morning, the Clockwork Butterfly would come to the Tree with a new curiosity. A profound question, a brilliant discovery, an ingenious invention. Using mere scraps of the Magpie, the Butterfly satiated endless curiosity with infinite creativity. Every morning, the Tree would tell the Butterfly it was proud of them, but it was lying. In every gear, servo, and mechanism, it only saw the faint whispers of the Magpie's stories, and reminders of what it had lost.

The Butterfly and the Lion are stated to be 4th-dimensional, making their existence fundamentally superior to the mortal realm, which is 3-dimensional. What mortals view as entire infinite universes with infinite timelines, these Gods view as objects they can physically manipulate. The Magpie is 5th-dimensional (and 6th before death), and the Tree of Shadows does not exist at all, so technically has no dimensionality. The Clockwork Butterfly is responsible for the creation of mortals, though all of the Gods have influenced them in some way. These Gods are also the source of magic, which is actually pieces of them- more on that in the relevant section about magic.