"It"

There exists a spiritual energy lifeform who enjoys traveling and observing multidimensional worlds. One day, Mitsuha Yamano gained the ability to travel between different worlds after fusing with a part of this lifeform when she was about to fall off a cliff. At that time, the lifeform experienced "pain" for the first time, and as gratitude, it granted Mitsuha Yamano self-healing abilities and the power to understand the language of anyone she converses with. Additionally, in manga and anime, it is characterized by appearing before Mitsuha Yamano in the form of a lucky cat.