Uraume

Uraume is a Curse User who has existed for a thousand years and served Ryomen Sukuna in the Heian era. In the present they are aligned with Kenjaku. Their Cursed Technique, Ice Formation, lets them create and manipulate ice, enough to freeze a large group of people at once, and they can heal themselves with the Reverse Cursed Technique. Uraume sends the curse users Juzo Kumiya and Haruta Shigemo to the exchange event as distractions, freezes the battlefield at the end of the Shibuya Incident and later gets Sukuna away from his first fight in Megumi Fushiguro's body. In the Shinjuku Showdown Kinji Hakari keeps them apart from Sukuna, and when Sukuna dies Uraume ends their own life.