As a special grade vengeful cursed spirit, Rika's power was unmatched. Fully manifesting Rika was considered a grave threat by the jujutsu higher-ups. By only manifesting her arms she could easily bring harm to non-sorcerers and jujutsu sorcerers alike. Once Yuta trusted his connection with her enough to allow her to fully manifest, Rika power eclipsed that of nearly all other curses.
Suguru Geto, a curse manipulator with well over four thousand cursed spirits in his possession believes that Rika is without a doubt the undisputed Queen of Curses. He risked everything to gain her power and had he been successful, Geto expected to have exactly what he needed to destroy all non-sorcerers.
With Rika's aid, Yuta Okkotsu was able to defeat Geto and overpower all the cursed spirits he threw at them. She supported him with physical attacks and used her speed to keep him from danger. To counter Geto's Maximum Uzumaki, Yuta broke the limits on Rika's cursed energy, making her more powerful than ever before.