The theme of identity might be developed through the man's experiences of having to pretend to be someone else. For example, he may have had to remember false family details. The struggle theme could be shown by his encounters with difficult living conditions or language barriers.
One possible theme could be identity. A 'paper son' often had to create a false identity to enter a new country. Another theme might be struggle. He would have faced many difficulties in a new land, like adapting to a different culture and finding a place to belong.
'Hotel on the Corner of Bitter and Sweet' by Jamie Ford is also a great choice. It is set in a particular historical context and tells the story of a Chinese - American family. It deals with themes of love, loss, and the struggle to fit in, which are elements that can be related to the story in 'Paper Son: One Man's Story'.
One key element could be deception. Since a 'paper son' is based on false papers, that would be central to the story. Another might be the man's motivation for becoming a 'paper son', like the hope for a better future.
I'm not sure specifically which 'paper son one man's story' you are referring to. It could be a very personal account of someone who was involved in the 'paper son' situation. Maybe it's about a man's journey through immigration or family history related to the 'paper son' concept.
'Maus' by Art Spiegelman. Although it is about the Holocaust, it shares the aspect of telling a personal and family - centered story within a larger historical context, just as 'Paper Son: One Man's Story' does within the context of Chinese immigration.
One possible theme could be transformation. Since it's 'the paper man', there might be a transformation from a simple paper state to something more complex or alive. Another could be the fragility of existence, as paper is a fragile material.
Mistakes play a big role in character development. In the fanfic, he could make an error at work that has consequences. But then, he takes responsibility for it, learns from it, and becomes more cautious and reliable in the future.
The Lizard might become more complex, with a deeper backstory revealed.
The son could be developed as more of an academic in the Pokémon world. Instead of focusing solely on battles like Ash, he could be interested in Pokémon research. He might study Pokémon behavior, evolution, or habitats in great detail. This would set him apart from his father and give him a unique role in the fanfiction.
The son's character could be developed through his interactions with his mother. He might be inspired by Fem Naruto's courage and determination, and grow up to be a strong - willed ninja. For instance, seeing his mother face difficult situations could make him want to be just as brave.