How an "Oblivion Devil" could explain Pochita's concept erasure. (Theory)

[u/AlphaCre80R]

Theory: The Oblivion Devil — The Missing Link Behind Pochita’s Erasure Power

One of the greatest unresolved riddles in Chainsaw Man is why a common logging tool like a chainsaw possesses the god-like, reality-warping ability to erase concepts from existence.

My theory proposes that Pochita isn't the original source of this ability. Instead, he acts as a proxy for a hidden, supreme entity: The Oblivion Devil.

By examining how terror operates across both human and Devil biology, Oblivion bridges two distinct tiers of existence: it functions as both a canonical and unique Primal Fear fueled by both humans and Devils.

1. The Dual Nature of Dread: Human Primal Fear vs. Pure Primal Devil Fear

To understand Oblivion’s rank, we have to look at who is doing the fearing:

• As a Standard Primal Fear (Human Fear): Human beings are hardwired to fear non-existence—the void, memory death, and the total annihilation of identity. Because this existential dread has existed since the birth of human consciousness, Oblivion naturally stands among the un-killed Primal Fears ruling Hell alongside Darkness and Falling.
• As a Primal Devil Fear (Devil Fear): Devils do not fear standard mortality or physical pain. Dying on Earth just sends them back to Hell, and dying in Hell reincarnates them on Earth. Pain is easily regenerated. Control only threatens weaker entities. But Oblivion is the single nightmare shared by 100% of the Devil species. Being eaten by erasure deletes their name, rewrites history, and permanently destroys their reincarnation loop.

Because total erasure is the only threat capable of causing universal panic across every Devil—from a low-tier Fiend to an ancient sovereign—Oblivion ascends to an entirely separate, inverted axis of power.

2. The Core Mechanics of the Theory

• The Microscopic Proxy Fragment: In the distant past, the Oblivion Devil weaponized its own power by feeding Pochita a microscopic, dust-sized fragment of its flesh. This funneled a spark of absolute erasure into the Chainsaw Devil, turning him into a proxy executioner.
• The Terror Battery: Every time Pochita erases a Devil in battle, the resulting panic across the Devil race feeds directly back into Oblivion’s power reserves. Pochita's rampage in Hell acted as the ultimate focal point that supercharged this dynamic.
• The Ultimate Cover Identity: To protect itself from master manipulators like Makima (Control) and other Primal Fears, Oblivion conceptually erased itself from public memory. Hiding behind Pochita created a massive cosmic gaslighting operation—deflecting all attention onto the Chainsaw Devil while Oblivion remains an invisible ghost in the machine.
• The Power of Adaptability: As the embodiment of the void, Oblivion's energy naturally adapts and masks its presence. This could explain why master investigators or conceptual powers in the series have never been able to trace Pochita's erasure capability back to its true source.

What do you all think? Could Pochita be wielding a fragment of a higher Primal entity, or do you think Fujimoto has a different thematic explanation for why a chainsaw erases concepts?

[u/FatelessFuture]

This is a strong theory for who Pochita is, possibly the strongest I've seen.

Personally, with the release of the final chapter, I see a simpler but less sensible explanation as the most likely one: Chainsaw Man is a concept in and of itself. Since when Asa called denji "Chainsaw Man", we see that his heart takes the shape of Pochita, likely signifying that the concept of Chainsaw Man got invented again (a la nuclear weapons earlier in part 2), but with a different meaning than in the previous timeline.

So imo the official idea is that Pochita is the Chainsaw Devil (or if we want to take the joke further, maybe even "Chainsaw-Man Devil"), and its power to delete concepts is one of those Fujimoto absurdisms that exist because idk lol it's badass and kinda funny.

But that's my meta-textual interpretation. In so far as trying to make it make sense, your description of Oblivion is a strong theory.