Another theme could be the relationship between the tigress and other animals in the area. Maybe there's a special bond with a certain other animal that helps her during her pregnancy. For example, a friendly deer that warns her of approaching danger. It often adds an element of inter - species cooperation to the story. And in some cases, it could also explore the reactions of the male tiger, if he's part of the story, towards the pregnancy. Whether he's supportive or causes some sort of conflict.
One common theme is the care and protection of the unborn cubs. The story might focus on how the tigress prepares a safe den and how she defends it from potential threats.
One common theme could be the anticipation and excitement around the new life. It might focus on how the tigress prepares for the arrival of her cubs. Another theme could be the changes in her relationships, like with her mate or other members of her group.
One common theme could be the adjustment of their relationship. With the pregnancy, they would need to adapt to new roles and emotions towards each other. Another theme might be the anticipation and excitement of a new life. They could be shown preparing for the arrival of their baby in different ways.
One common theme could be the challenges of motherhood from the perspective of a tigress. Another might be the relationship changes within the tigress's social group. For example, how other tigers interact with her during her pregnancy.
One common theme could be the tigress facing some form of physical injury. Maybe she's been in a fight or an accident within the fictional world.
Another theme is self - discovery. Both the master and the tigress might learn more about themselves through their relationship. They could discover new powers or aspects of their personalities. For instance, the master might find out he has a more compassionate side because of the tigress.
One common theme is friendship. The OC often becomes a friend to Tigress and helps her grow as a character. Another theme is adventure. They might go on quests together in the Kung Fu Panda world.
One common theme is their relationship development. It could be from friends to something more romantic. For example, in some fanfictions, they gradually realize their feelings for each other during their training sessions or while on a mission together.
One common theme is the exploration of differences. Since the tigress and the viper are very different in nature, fanfictions often delve into how they overcome these differences. For example, the tigress is a large, powerful mammal, while the viper is a slithering reptile. Another theme is the idea of mutual benefit. They might help each other in the fictional stories, like the tigress providing protection and the viper providing something unique like venom for medicinal purposes in some stories.
One common theme is adventure. Since they are both from the Kung Fu Panda universe, stories might involve them going on quests together. For example, they could be on a mission to save their village from a new threat.
One common theme could be the exploration of an unusual relationship. Since it involves a tigress, there might be themes of the power dynamics between the two characters. Another theme could be the acceptance of the differences between the human (assuming 'po' represents a human) and the tigress.