Ryomen Sukuna is one of the main antagonists in the entire series of Jujutsu Kaisen, and his overwhelming presence has become increasingly evident over time.
In the latest chapter of the Jujutsu Kaisen manga, during a battle against Kashimo, the Cursed King Ryomen Sukuna utilizes his ultimate technique. This marks a return to his original form, showcasing the raw power he possesses as he embarks on a new reincarnation process.

He possesses a monstrous form with multiple arms and two mouths. This shape of Sukuna allows him to manipulate cursed energy in unique ways, drawing from the entirety of his vast cursed energy reservoir, using it to unleash devastating techniques and attacks.
But why does Sukuna have multiple arms and two mouths?
The answer lies in a highly speculative theory suggesting that Sukuna in Jujutsu Kaisen draws inspiration from folklore about a pair of conjoined twins. The King of Curses Sukuna could very well be a representation of such a conjoined twin pair, explaining his multiple limbs and mouths.
In the world of Jujutsu Kaisen, being born with such traits is considered a curse. This notion is further emphasized through the experiences of Maki and Mai.

According to the lore surrounding Sukuna that the series presents, a man named Tengoku acquired a pair of conjoined twins and completely immersed himself in their powers. Ultimately, one of the two twins ended up succumbing to the other, which may have a direct correlation with Sukuna in Jujutsu Kaisen.
Moreover, after Sukuna devours his twin brother, he becomes known as a cursed spirit with multiple arms and mouths. Sukuna himself is also an entity of great power, which is why he has considerable cursed energy.
This explains why Sukuna possesses such an overwhelming amount of cursed energy in his state. Although his cursed energy might be exceptionally high, its encounter with Yuta proves to be entirely futile. However, if we consider the fact that he might have absorbed the cursed energy of his conjoined twin, then the entire situation begins to make sense.
Nonetheless, this remains merely a theory. There is a possibility that it is highly speculative and is often debated among fans. The fact that a cursed spirit in the world of Jujutsu Kaisen is not considered normal when born with additional limbs and mouths cannot be overlooked.
This unique form of Sukuna undoubtedly has connections to the complex nature of cursed energy, and we can only wait for the author Gege to further elaborate on this in the future!