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.
Friendship could be a common theme. Maybe the story focuses on how Po and Tigress grow closer as friends and support each other through various challenges.
No, it is not ethical. Tigers are an endangered species, and creating such fanfiction involves inappropriate and unethical implications of inter - species relationships that go against nature and ethical norms.
There are often fanfiction communities on platforms like Tumblr as well. Some fans might share their tigress x po fanfiction there. You can search using relevant tags like 'tigress x po' or 'kung fu panda fanfiction' to narrow down your search.
I'm not sure specifically about 'po x tigress' pregnant fanfiction. Fanfiction can cover a wide range of themes and pairings, but this one might be quite specific. You could try searching on dedicated fanfiction websites to see if any exist.
The idea of Po x Tigress lemon fanfiction is quite controversial. On one hand, fanfiction is a way for fans to explore different aspects of characters' relationships. But on the other hand, the 'lemon' part might involve content that goes against the family - friendly nature of the original Kung Fu Panda. If the fanfiction can manage to be a more innocent exploration of their relationship, like a deep emotional bond with some added fictional elements that are not inappropriate, then it might be okay. But if it's full of explicit content, it should be clearly marked as for mature audiences only.
There could potentially be such a fanfic out there, but it's not a common or mainstream pairing in the Kung Fu Panda fandom. Fanfic writers often come up with all sorts of creative pairings, so it's possible that someone has written about tigress and po in a lemon - inspired way. However, these types of fanfics might not be easy to find as they may not be widely promoted or may even violate the terms of some platforms if they contain inappropriate content.
Self - discovery can be another theme. As they interact more closely in these fanfics, both Tigress and Po might discover new aspects of themselves. Tigress could become more open - hearted, and Po could find new depths to his courage and leadership skills, all while their relationship blossoms.
You could start by looking at large fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Use their search functions and type in 'po x tigress pregnant' to see if any stories come up.
Finding 'lemon' fanfiction which often contains adult - like content is not something that should be promoted on mainstream platforms. It's better to look for general Po x Tigress fanfiction on well - known fanfiction websites like Archive of Our Own or FanFiction.net. But remember, any fanfiction should abide by the website's terms of service, and those sites usually don't allow explicit content.