Grace is presumably the protagonist. Since the story is named 'grace and the time machine story', she is the central figure. She may be an ordinary person at first, but through her association with the time machine, she embarks on extraordinary journeys through time. Maybe she's a curious person, always eager to explore and learn, which is why she gets involved with the time machine in the first place.
Natalia Grace is the person at the heart of this complex story. She was adopted, and then there were doubts and disputes regarding her age and behavior within her adoptive family.
The relationship between Rulai Buddha and Guan Yin Bodhisattva was that Rulai Buddha was Guan Yin Bodhisattva's teacher and master, while Guan Yin Bodhisattva was Rulai Buddha's disciple and believer. Gautama Buddha was the highest existence in Buddhism and was ranked first among the Buddhas of the Ten Directions and Three Generations. Guanyin Bodhisattva was the disciple of the Buddhas of the Ten Directions and Three Generations, the one with the most compassion and wisdom. Gautama Buddha had great respect for Guan Yin Bodhisattva. Guan Yin Bodhisattva was the embodiment of great compassion. She had infinite wisdom and compassion, and she took it upon herself to benefit all living beings. Guan Yin Bodhisattva had three main paths of cultivation, namely, cultivating benevolence, cultivating wisdom, and cultivating. Guan Yin Bodhisattva practiced his compassion and wisdom through cultivation, incarnated to save all living beings, and helped them transcend reincarnation.