Sukuna

Sukuna or Double-Faced Specter is one of the main antagonists in Jujutsu Kaisen.

According to the legend, a thousand years ago he was a human during the prime of the sorcery and shamans gave their all to defeat him, but failed. After his dead, they weren't even able to destroy his body and it crossed into the human world as cursed charms.

Appearance
His past appearance is described in the past as fierce god with four arms and two heads and four eyes. Currently he appears similar to the host he is on, but with spiked hair and with special marks/lines on his forehead, nose, cheeks and body. He also have a second pair of eyes under his normal eyes, which are usually closed.