The theme is-never forget the truest self.
Mom and Dad forgot about restraint and became pigs.
Because the faceless man was too lonely, he forgot his kindness, and ate one after another, and turned into a monster that swallowed.
Granny Tang has forgotten the kindness in her heart and used all means to make money. Her tenderness can only be seen when facing the baby.
Bai forgot his name and became a puppet.
...
Chihiro has always been a person who has not forgotten himself.
She remembers to be kind, remember to be polite to others, remember to do everything to help her friends, always remember to work hard to rescue her parents and return to the human world, and always remember her name.
Chihiro's adventure in another world is a process of gradually helping everyone find their truest self.
Her appearance,
Let Xiaobai no longer be a puppet who only listens to Mrs. Tang's instructions to do evil everywhere;
Let the monsters in the hot springs including Grandpa Boiler and Xiaoling have unity and help others;
Let faceless men no longer do evil because of loneliness;
Let the baby no longer be so solemn;
...
Because of Chihiro, everyone is better.
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