Well, perhaps the Avengers could be at a party and accidentally get drunk on some alien beverage. Then they start acting out of character, like Thor trying to dance like a pop star and Iron Man making really silly gadgets just for fun.
Perhaps the story in the 'drunk mlp fanfic' is centered around a group of ponies who accidentally consume some enchanted cider that makes them drunk. They then start seeing strange visions and go on a wacky journey to find a cure, all while their normal pony friends are trying to figure out what's wrong with them.
Well, perhaps Daria, being drunk and without her glasses, stumbles into an Avengers gathering by mistake. She could start blabbering some drunken wisdom that the Avengers find both amusing and oddly profound. Maybe she gives Captain America some off - the - wall advice on modern society, all while the other Avengers are trying to figure out who this strange, inebriated girl is.
It could be that they are on a mission together and get poisoned by some magical substance that has the side effect of making them drunk. In their inebriated state, they start reminiscing about their past, from their first meetings to their first kisses. This trip down memory lane makes them realize how much they truly love each other and how far they've come as a couple.
One plot could be that the cat avengers are split into two groups due to a misunderstanding. One group believes that the other is working with a group of rats who are stealing cat food. As they fight among themselves, the real villains, a gang of raccoons, start to take over the town. Eventually, the cats realize their mistake and reunite. They then use their combined powers, like the flying cat to scout the raccoons' movements, the strong cat to fight them directly, and the invisible cat to launch surprise attacks, to drive the raccoons out of the town.
The plot might involve a new villain who hacks into their chatroom. So, the Avengers have to figure out how to stop this digital threat while also communicating within the chatroom to coordinate their efforts. They could be discussing their individual strengths and how to use them against this new enemy. For example, Captain America could be leading the conversation on strategy, while Black Widow provides intel she's gathered. Hulk might be there just being Hulk, with the others trying to keep him calm and on track. And all of this happening in the unique setting of a chatroom, which adds a modern and interesting twist to the typical Avengers story.
Well, it could be about the Avengers having a peaceful slumber in their tower. Maybe they're all having dreams related to their past battles or future threats. For example, Iron Man might dream about improving his suit in his sleep, while Captain America dreams of the old days in Brooklyn.
The plot might involve the Avengers shopping for gifts for each other. For instance, Thor could be looking for something Asgardian - themed for Captain America. They'd have a lot of banter and funny moments as they try to figure out what to get.
Another idea is that a villain creates a rift between the two universes. The Avengers and Merlin have to team up to close this rift. During their journey, they exchange skills and knowledge. Black Widow could teach Merlin some combat skills, while Merlin could show the Avengers how to use magic in a more strategic way. This way, they not only close the rift but also become stronger as a combined force.
Well, perhaps Thor is injured while on a solo mission for the Avengers. He might be exploring an ancient ruin in search of a powerful weapon to help the team, but there are hidden traps. One such trap injures him severely. His injury could then be a catalyst for the other Avengers to learn more about the place where he got hurt and also about the weapon he was after.
Well, it could be about the Avengers suddenly appearing in our modern world. Maybe they have to deal with things like modern technology that they're not used to, like trying to figure out how smartphones work while also fighting off villains who are using the chaos of their arrival to cause more trouble.