Who Is the Queen of Curses in Jujutsu Kaisen?

In Jujutsu Kaisen 0, Yuta was able to unleash the strongest curse in Jujutsu Kaisen, Pure Love, by wielding Rika’s cursed energy. The movie also saw her summoning a megaphone from the Inumaki family to assist Yuta, enabling the latter to use the cursed speech manipulation technique. All in all, with her overwhelming power, Rika stands out as the Queen of Curses in JJK. 

Why is Rika the Queen of Curses?

After she died, Rika continued to haunt Yuta as a cursed spirit in an attempt to protect him. Unfortunately, due to her overwhelming power, she sometimes harmed him without intending to do so. However, in a poignant moment of separation, Yuta set Rika free, but her status as the Queen of Curses was sustained.