how did sukuna become a curse

Ryomen Sukuna became a curse after his death as a human sorcerer over 1,000 years ago, when his extreme malice and negative energy turned him into the “King of Curses,” and his soul was preserved inside 20 cursed fingers that survived into the present.

Was Sukuna Human First?

Most sources agree that Sukuna was originally a human —specifically a terrifyingly powerful jujutsu sorcerer or “curse user” during the Heian era, known as the golden age of sorcery.

He was so monstrously strong and cruel that people of that time treated him less like a person and more like a walking disaster or calamity.

• Over 1,000 years ago, Sukuna lived as a human curse user at the peak of sorcery.

• His appearance and reputation draw from the Ryōmen-sukuna myth: a two‑faced, four‑armed demonic figure.

Because of this, a lot of modern forum discussion centers on whether he should be classified as a “human who became a curse” or “basically a curse in human skin.”

How Did He Turn Into a Curse?

The series has not shown a step‑by‑step, fully animated backstory of his death yet, but the broad outline is clear: he died as a human, and his hatred turned him into a vengeful cursed spirit.

Core points from the lore

• Sukuna’s human life ended roughly 1,000 years before the main story.

• After death, the immense negative energy he accumulated from endless killing, cruelty, and hatred did not disperse.

• That grudge and malice manifested as a special‑grade vengeful cursed spirit, the “King of Curses” we see in the present.

In other words, how did Sukuna become a curse?

He died as a monstrously evil human sorcerer, and the sheer amount of cursed energy and hatred he left behind crystallized into a vengeful cursed spirit instead of passing on.

Some fan and article speculation suggests possibilities like being killed in battle, assassinated, sealed and then killed, or even dying of illness, but the official story keeps the exact cause of death ambiguous.

What’s With the 20 Cursed Fingers?

The famous 20 fingers are the reason Sukuna can still exist and reincarnate in the modern era.

• Sukuna’s power was too great to erase, so ancient sorcerers decided to dismember and seal him instead of trying to destroy him outright.

• His soul and power were divided into his 20 fingers, which became special‑grade cursed objects that could not be destroyed.

• These fingers survived for over a thousand years, circulating through history until characters in the present day begin to find and consume them.

Later lore adds an extra layer: over a thousand years ago, Sukuna made a contract with Kenjaku during preparations for the Culling Game, and as part of that, his soul was intentionally split between his twenty fingers to ensure he could live on after death.

This ties together the “too evil to pass on naturally” angle with a deliberate sorcerer‑made method of preserving his existence.

How Fans and Forums Talk About It

Since the anime (as of early 2026) has not fully animated Sukuna’s childhood and death arc, much of the discussion is driven by manga chapters, databook hints, and interviews.

Common viewpoints in forum and discussion threads:

• “Human who became a curse” view
  • Emphasizes he was originally a human curse user whose death created a vengeful spirit, like other powerful sorcerers who leave strong curses behind.

• “He was basically a curse even as a human” view
  • Focuses on how he was already treated as a disaster, suggesting the line between sorcerer and curse barely applied to him.

• Speculation about his death
  • Theories include a final battle against multiple top sorcerers, betrayal, sealing gone wrong, or a combination of sealing and execution.

Newer manga chapters also explore his twisted family ties and reincarnation via Yuji Itadori, reinforcing that his soul is actively engineered to persist across generations, not just “naturally” cursed.

Quick Recap (TL;DR)

• Sukuna started out as a terrifyingly powerful human curse user in the Heian era.

• After he died, his overwhelming hatred and cursed energy turned him into a vengeful cursed spirit, the King of Curses.

• Ancient sorcerers and Kenjaku’s scheme split his soul and power into 20 indestructible fingers, letting him survive for a millennium and eventually reincarnate through Yuji.

Information gathered from public forums or data available on the internet and portrayed here.