In some fanfictions, Happy gets involved in a prank war within the Fairy Tail guild. For example, he might team up with Lucy to play a prank on Gray. They could use his stripping habit against him by making his clothes disappear in a really embarrassing situation, like in the middle of a speech in front of the whole guild. This creates a really humorous and chaotic scene full of laughter.
One of the funniest scenarios could be when Happy tries to 'help' Natsu cook but just ends up making a huge mess. He might accidentally add too much of an ingredient or knock over pots while flying around the kitchen in excitement.
Happy's simple - mindedness often leads to humorous situations. He might misunderstand a complex plan in the guild and go off on his own tangent, creating chaos. For example, if the guild is planning a surprise party for someone and Happy misinterprets the instructions, he could end up ruining the surprise in a really comical way.
One idea could be that Happy's death shatters the Fairy Tail guild. Natsu, being his closest friend, goes into a deep depression. The guild loses its usual cheer and the members struggle to come to terms with the loss. They might hold a grand memorial for Happy, and throughout the fanfiction, it could show how each character copes in their own way, like Lucy writing in her diary about all the memories she had with Happy.
There can be all sorts of 'what if' scenarios. Maybe what if Natsu never joined Fairy Tail? Or what if Lucy had a different kind of magic?
One idea could be that in their human forms, Happy and Carla are part of a detective agency in Magnolia. Happy is the enthusiastic junior detective while Carla is the more serious and observant one. They solve mysteries related to magic items that have gone missing, often running into other Fairy Tail members who unknowingly hold clues.
Another possibility is an accident within the story. Perhaps during a chaotic battle or a magical experiment gone wrong, Happy could be caught in the crossfire or affected by some unforeseen magical consequence. This would be a tragic turn of events for the usually cheerful and helpful Exceed.
Maybe they leave because they want to search for answers about their pasts. Happy might want to know more about his origins, and Lucy could be seeking something related to her family's history.
For Natsu, it would be devastating. Happy has been his constant companion since they were young. Natsu would likely be filled with rage and grief, which could potentially lead him to seek revenge against whoever or whatever caused Happy's death.
There's a fanfiction called 'Happy and the Lost Treasure'. In this story, Happy teams up with some unlikely allies in search of a legendary treasure. It has a lot of humor as Happy's antics keep the other characters on their toes. The story also has some really cool action scenes where Happy uses his flying skills to outmaneuver enemies.
The 'Happy Fairy Tail' manga stands out for its unique characters and engaging storylines. The magic and adventure elements keep you hooked.
One great scenario could be a date with Gray Fullbuster in the fanfiction. He might take his partner to a frozen lake he created just for them. They could skate on the ice, and Gray would be his usual cool self, but also show his softer side by making sure his partner doesn't fall. Another scenario could involve Natsu Dragneel. He'd probably take his love interest on an adventure to find a rare magical item. Along the way, they'd face challenges together and Natsu would be super protective.