A crossover with a fantasy - themed story like 'Lord of the Rings' could be amazing. Imagine the Dream SMP characters in Middle - earth. Tommy could be like a young hobbit getting into all sorts of mischief, and Dream could be a sort of dark wizard - like figure. They'd have to deal with orcs, trolls, and all the other classic LOTR threats.
One interesting plot idea could be a character traveling back in time to prevent a major war on the SMP. They could change key events and alliances, leading to a completely different SMP landscape. For example, if Tommyinnit went back to before the L'Manberg revolution, he might be able to stop Schlatt from taking over in the first place. Another idea is a character from the future coming back to warn the current SMP members about a looming threat that they don't yet know about. This could create a sense of urgency and force characters to make difficult decisions. And perhaps a time - traveling villain who is trying to rewrite history for their own gain, like stealing all the valuable resources before they were ever discovered.
A cool plot might be that the BNHA villains discover the Dream SMP and see it as a new place to expand their evil plans. They kidnap some of the SMP members thinking they can use them for something. The SMP members then team up with the BNHA heroes to fight back. Techno could use his combat skills and the BNHA heroes would be amazed at his fighting style without having a Quirk. And the SMP members could learn about the importance of working as a team like the BNHA heroes do.
Niki is another underrated character. If there was a crossover with a fairy - tale world, she could be a powerful fairy or a kind - hearted witch. Her baking skills could be turned into magical potions or enchanted treats. She has a lot of depth to her character that could be explored in a different setting.
The 'dream smp full story' is centered around a Minecraft server where different players with their own personalities and goals interact. The story has a lot of elements such as territorial disputes. Some characters want to expand their territories while others want to protect what they have. There are also moments of great heroism and cowardice. Characters make sacrifices for their friends or betray them for personal gain. And the story keeps evolving as new characters join and new events unfold.
One idea could be a character from the Enclave finding themselves in a situation where they have to team up with a group from the Fallout world they usually oppose. Maybe a lone Enclave soldier gets separated from his unit and is forced to rely on a group of wastelanders to survive. This could lead to a lot of character development as he sees a different side of the world outside the Enclave's ideology.
TommyInnit and Midoriya would be an interesting pair. Tommy is impulsive and often gets into trouble, while Midoriya is more level - headed and heroic. Midoriya could try to teach Tommy about the values of being a hero, and Tommy could introduce Midoriya to his more carefree and unorthodox ways of doing things.
One idea could be that the Turtles from 1987 end up in the 2003 universe and have to adapt to the darker and more serious tone. They could team up with the 2003 Turtles to fight a common enemy like the Shredder. The 1987 Turtles' more light - hearted and comical ways might initially clash with the 2003 Turtles' brooding nature, but they eventually learn from each other.
One idea could be a crossover with Undertale. The characters from Glitchtale could interact with the original Undertale characters in a new and unexpected way. For example, Betty from Glitchtale could team up with Chara from Undertale for some sort of dark plan. Another plot could involve a crossover with a different game like Minecraft. The Glitchtale characters could find themselves in a blocky world, having to adapt to new rules and enemies. Maybe Sans from Glitchtale could use his powers in the Minecraft world in a really creative way.
A great plot idea would be Android 21 crossing into a world where technology is feared. She'd have to prove that not all advanced technology is bad. Also, she could cross into a world of pirates, using her skills to navigate the high seas and fight off other pirates.
A plot idea could involve a magical crossover. Maybe a character from a magical fanfiction world accidentally enters the Wayside School. This could lead to chaos as the normal rules of the school are disrupted. The students might have to learn about magic to help the new character return home, and in the process, they gain some magical abilities themselves for a short time. This could also create new friendships and rivalries among the characters.