No. 'Happy Tree Friends' is an animated series known for its extreme and often gory content, but it is not based on a true story. It's a fictional creation designed to be darkly comical in a very extreme way.
One interesting story could be about how the characters overcome a big natural disaster in their forest. For example, when a huge flood comes, they have to work together to build rafts and find high ground. It shows a different side of the usually comically violent characters, highlighting their survival instincts and ability to cooperate in extreme situations.
You can start by looking on fanfiction websites such as Archive of Our Own (AO3). It has a large collection of various fanfictions, and there's a good chance you'll find Happy Tree Friends human fanfiction there. Another option is FanFiction.net, which also hosts a wide range of fan - created stories.
Well, in some Happy Tree Friends human fanfiction, the authors might take the concept of the show's dark humor and translate it into a human context. Maybe they create situations where the characters accidentally get into trouble in a more believable, human - scale way. Another idea could be that the fanfictions explore the relationships between the characters in a more complex way than in the original show. For instance, delving deeper into the love - hate relationships among them.
One idea could be a time - travel plot where a character goes back in time to prevent a tragic event that usually happens in the regular Happy Tree Friends episodes. For example, Flaky could go back to stop Cuddles from getting into a dangerous situation that leads to his untimely death.
Cuddles is often a popular choice. His cute and innocent appearance makes for an interesting contrast when he gets into the typically gory situations of Happy Tree Friends. Writers can explore different sides of his character, like how he might react in a more heroic situation rather than just being a victim all the time.
One common theme is the contrast between their personalities. Flippy's tough - exterior - due - to - his - military - past and Flaky's timidness make for an interesting exploration of how they interact.
In fanfiction, the characters can be developed in different directions. While in the original show their personalities are more or less fixed in the context of those short, often gory situations. Fanfiction writers might give a character like Cuddles a more serious side or make Flippy more in control of his violent alter - ego. It's all about the creative freedom of the writers.
Well, in these fanfics, a common theme could be adaptation. Handy and Petunia are both characters with their own quirks and challenges. Fanfics might explore how they adapt to each other's presence. For example, Handy being a handyman - like character and Petunia being more of a... well, a character with her own personality. They might have to adapt to each other's habits and ways of doing things. There could also be themes related to forgiveness, as in this world, mistakes (usually very gory ones) are common, and they might have to forgive each other for things that happen during their adventures or interactions.
The inspiration likely comes from a desire to create something unique and shock - value - driven. The contrast between cute animal characters and extreme violence was probably an interesting concept to explore in an animated form.