Well, a really cool plot could be that the villains from different arcs in Naruto are brought into a group chat by some mysterious force. They start to plot together, but their different egos and goals lead to chaos within the chat. It would be interesting to see how they interact and if they could actually form a united front. And also, a plot where the old generation of ninja like Kakashi, Gai, and Asuma start a group chat to give advice to the new generation would be quite heartwarming and full of wisdom.
One idea could be a group chat where Naruto, Sasuke, and Sakura discuss their future dreams after the war. Another could be a chat where all the different ninja clans come together to plan a joint mission through a group chat.
Perhaps a group chat where Naruto accidentally adds some of the tailed beasts. They start sharing their experiences of being sealed and their views on the world. Or, a group chat where the female ninja in Naruto get together to talk about their training, their relationships, and how they deal with being in a male - dominated ninja world. This could show a different side of the female characters and their bond with each other.
Another plot could be that a new member is added to the Young Justice group chat. The existing members are a bit skeptical at first, but as they start chatting, they realize the new member has some unique skills and knowledge. Through the group chat conversations, they gradually build trust and start to include the new member in their missions.
Another plot could be that Peter starts a friendly competition in the group chat about who can do the most good deeds in a week. Everyone gets really into it, and they share their experiences. But then things go wrong when a misunderstanding makes it seem like one of them is cheating, and Peter has to smooth things over and remind them of the real purpose of the competition.
One idea could be a group chat where the students from Class 1 - A are secretly planning a surprise party for All Might. They discuss his favorite things, like American comics and beef stew, in the chat. Another could be a group chat between the villains, where they argue about their next big evil plan and Shigaraki is constantly getting frustrated with Dabi's snarky remarks. A third idea is a cross - class group chat where the students from different hero classes share their training experiences and give each other tips on how to improve their quirks.
Well, one interesting scenario could be when the characters from Naruto start sharing their most embarrassing training moments in the group chat. It would be hilarious to see Naruto talk about how he accidentally blew up his own clone during a jutsu practice.
Another storyline could involve them using the group chat to plan a surprise party for one of their friends at Beacon Academy. They'd discuss decorations, food, and how to keep it a secret. There could be some comical moments when things almost go wrong during the planning process.
One interesting storyline could be the Pokémon themselves having a group chat to plan a surprise party for their trainers. They secretly communicate about getting the right gifts, like a Pikachu finding a rare Thunder Stone for its trainer who wants to evolve it further.
One idea could be that Chat Noir and Ladybug discover they have a baby in the future due to some time - traveling villain's plot. They then have to figure out how to raise the baby while still protecting Paris. Another could be a magical baby is sent to them for protection, and they have to keep it a secret from Hawk Moth.
A great plot for a Percy Jackson chat room fanfiction could be a competition organized within the chat room. The demigods compete in challenges that test their skills, like a riddle - solving competition based on Greek mythology, or a virtual battle where they have to strategize using their powers. The winner could get a special prize, like a rare magical item. Or perhaps the chat room is used as a platform for demigods to find partners for a secret mission that requires a combination of different skills, like a son of Poseidon teaming up with a daughter of Athena.
How about a fanfiction where there's a new villain in Paris who has the power to nullify the Miraculous? Ladybug and Chat Noir would have to find a way to regain their powers or find new ways to fight this powerful enemy without relying on their usual abilities.
Well, in some 'avengers group chat fanfic', the most interesting plot could be when they start making fun of each other's superhero costumes in the chat. It adds a really humorous touch to their otherwise serious superhero personas.