Well, in 'the lost tomb fan fiction', a cool plot idea might be that the tomb is not just a resting place for the dead but a gateway to another dimension. The characters have to figure out how to close it before something from that other world escapes. Also, there could be a plot where the characters find out that the tomb was built by an advanced civilization, and they have to learn their technology to survive.
In some 'the lost tomb fan fiction', there could be a plot where the main character has a vision or a premonition about the tomb. This leads them on a journey to find it before an evil organization does. Along the way, they face many challenges and meet other tomb raiders. They might also discover that the tomb has a self - defense mechanism that is activated when someone tries to enter without permission.
One idea could be exploring the backstory of a minor character in more depth. For example, the character's family history and how it might be related to the overall mystery in the Keeper of the Lost Cities world.
Another interesting plot could be that the world of heavens lost property gets merged with a parallel universe where the rules are slightly different. The characters would have to adapt to the new situation, and there could be new villains or challenges. For instance, the Angeloids' powers might work differently, and they would need to figure out how to use them effectively. Tomoki would also have to deal with a version of himself from the other universe, and they could either cooperate or compete depending on the circumstances.
One idea could be a story where the Mandalorian has to team up with an old enemy to fight a new, greater threat. Maybe a powerful Sith Lord emerges and they have to put aside their differences.
One idea could be exploring a different origin for Toothless. Maybe he was part of an ancient dragon tribe that was thought to be extinct. Another could be a story where Hiccup discovers a new dragon species that has unique abilities and forms an alliance with them. A third idea is a time - travel fan fiction where Hiccup goes back in time to prevent a great dragon war from ever starting.
A great plot for Warframe fan fiction could be a Tenno getting trapped in a parallel dimension where the rules of the Origin System are all messed up. They have to find a way back while dealing with strange versions of familiar enemies. Or perhaps a story about a Tenno who discovers a hidden Orokin vault that contains not only powerful weapons but also a secret that could change the balance of power in the Origin System. Also, a plot about a Tenno's struggle to control a newly acquired and extremely powerful Warframe that has a mind of its own could be really engaging.
Well, you could have a survivor fan fiction where a contestant has a hidden skill, like being able to communicate with animals on the island. This could give them an edge in finding food and avoiding danger. Or perhaps a story where there's a traitor within the group, someone who is secretly working with the show's producers to create more drama. Also, a plot where the survivors find a map that leads to a hidden part of the island with a bountiful supply of food and shelter.
One idea could be that the Ghostbusters discover a new type of ghost that can possess technology. So they have to find a way to stop it from taking over all the electronics in the city. It would be a race against time as the city starts to descend into chaos with machines going haywire.
One idea could be a story where a minor character from the game gets a chance to become a hero. For example, a low - level soldier who discovers a hidden power within himself and uses it to save his comrades during a crucial battle.
One interesting plot idea could be exploring what would happen if Aladdin's three wishes had unforeseen consequences that affected not just him but the whole city. For example, a wish for wealth might lead to an economic imbalance.
One idea could be Yzma getting a chance to redeem herself. Maybe she accidentally discovers a new magic that can reverse all the bad things she's done in the past and she has to decide whether to use it for good or for her own gain.