One possible theme could be the exploration of the unusual or the unexpected in relationships. Having a gorilla as a wife is far from the norm, so it might be about how to deal with something completely different in a relationship.
Another theme could be a satirical take on marriage or relationships in general. By presenting such an absurd concept as a gorilla for a wife, it could be poking fun at the often - complex and sometimes strange nature of human relationships, and how we sometimes find ourselves in situations that seem completely out of the ordinary.
If such a Japanese novel exists, possible themes could include friendship. Pippi is often making friends and having adventures with others, and this could be emphasized in a Japanese version. Another theme might be individuality. Pippi is very much her own person, and the Japanese novel could explore how being unique is important. Also, family - like relationships could be a theme. Even though Pippi doesn't have a traditional family, she forms bonds with those around her, and this could be further developed in a Japanese cultural context.
I'm not really sure if there are many novels exactly like 'My wife is a gorilla'. However, Japanese literature has a wide range of works. You could try looking into the works of Haruki Murakami. His novels often have unique and surreal elements, though not the same as this specific one.
One possible theme could be survival. Gorillas have to survive in their natural habitats which can be full of challenges. Another theme might be family, as gorillas are social animals and family units are important to them.
Another theme could be isolation. The moon is up in the sky, far away, and if it doesn't understand the heart, it shows that the character feels alone in their emotions. They may have some deep - seated feelings that no one, not even something as seemingly all - knowing as the moon, can fathom. It could also be about the struggle between inner emotions and the external world. The moon is part of the natural world, and if it doesn't understand the heart, it means that the character's internal emotional state is at odds with the outside environment, perhaps feeling out of place or not understood by society.
One possible theme could be an unconventional form of love. The 'tentacles' might symbolize something that is different or outside the norm in a relationship, like an all - encompassing love that reaches out in various ways, just as tentacles do.
One possible theme could be devotion. If a wife is considered as one's life, it implies a high level of commitment and loyalty. Another theme might be the significance of the relationship in shaping one's identity. Since the wife is equated to life, she probably has a major impact on who the person is.
One possible theme could be social change. In India, there are many social issues like caste discrimination, poverty. The 'dream' in the title might refer to a character's vision for a more equal and prosperous society.
The theme of acceptance might be prominent. The little girl might grow up learning to accept her father's deafness and seeing it as just a part of who he is. And the husband himself could be on a journey of self - acceptance in relation to his role as a father. Also, it could touch on the theme of communication. How does the family communicate effectively with a deaf member? This could be explored in the fanfiction.
The plot could involve a wife who has always been very conservative and proper in her behavior. Maybe she has lived a very routine - based life, following all the social norms. Then, something happens, like she meets an old friend who has a very different lifestyle, or she discovers a new hobby that makes her see life from a different perspective. This could lead her to start breaking out of her shell and becoming more adventurous and 'wild' in her actions and decisions.
One possible theme could be love. Love often plays a significant role in novels, whether it's romantic love, love between family members or friendship love.