Here's why:
* Isabelle: Isabelle is Hugo's equal in the story. She is the one who helps him understand his past and her own connection to his deceased father. Her curiosity and love for film are essential to Hugo's growth and the plot's resolution.
* George Méliès: The famed filmmaker's story intertwines with Hugo's, and his presence fuels the heart of the story. His past, his invention, and his connection to Hugo's father create a complex and moving subplot that directly impacts Hugo's life.
* Hugo's father: Though deceased, Hugo's father is a driving force behind his actions. His invention, his love for cinema, and his mysterious disappearance push Hugo to uncover the truth and find his place in the world.
* The Station Master: This stern figure acts as a catalyst for Hugo's development, shaping his actions and encouraging his growth. He represents the harsh realities of the world and the struggle for survival.
While Hugo's journey is essential to the plot, it's the interconnectedness of all these characters that makes "The Invention of Hugo Cabret" so powerful. It's a story about loss, discovery, and the healing power of love and imagination.
Therefore, it's more accurate to say that each character plays a crucial role in the story's development and meaning.