Another concept could be a crossover with Battlestar Galactica. The humans in Battlestar Galactica are constantly on the run from the Cylons. If the Taelons entered this universe, they might try to manipulate both sides for their own gain. The humans would be suspicious of them, and the Cylons might see the Taelons as either a threat or a potential partner in their war against humanity.
A crossover with Stargate SG - 1 could also be fascinating. The Goa'uld and the Taelons both have an interest in power and domination. The SGC could get involved when they notice the Taelons' activities on Earth. They might try to figure out if the Taelons are another alien race like the Goa'uld or something entirely different.
One idea could be exploring the backstories of the Taelons in more detail. Maybe a fanfiction about a Taelon who questions their race's motives and actions on Earth. Another could be a story focused on the human resistance, their daily struggles and how they plan their strategies. A third idea might be a love story between a human and a Taelon who try to bridge the gap between their two species.
Next, think of a central plot point that brings the two universes together. For example, if crossing over with Doctor Who, it could be that the Doctor detects some strange energy related to the Taelons and decides to investigate. This will serve as the starting point for your story. You also need to consider how the characters from each universe will interact. Will they be friends, enemies, or something in between? And finally, start writing. Don't worry too much about making it perfect at first. Just get your ideas down on paper (or on the screen).
One idea could be that Godzilla Earth teams up with a group of humans who have developed advanced technology to fight off an alien invasion. The humans initially fear Godzilla but soon realize they need his power.
One idea could be a crossover with 'Rick and Morty'. Gary could team up with Rick and they'd have some wild adventures across different dimensions. Maybe they'd encounter some new alien species together that are a combination of the creatures from both shows.
One idea could be a crossover with Street Fighter. Imagine the characters from Final Fight teaming up with Ryu and Ken to fight a new, powerful villain that threatens both their worlds. The different fighting styles would create really cool battle scenes.
One idea could be a crossover with the 'Harry Potter' universe. Squall could be a wizard, and his gunblade could be enchanted. Another could be a crossover with 'Star Wars', where the characters from Final Fantasy 8 are in the middle of the galactic conflict. Maybe Laguna could be a Jedi - like figure.
One idea could be a crossover between Final Fantasy VII and Final Fantasy X. Imagine Cloud and Tidus teaming up to fight a new powerful enemy. Another could be a crossover with a non - Final Fantasy franchise like Pokemon. Picture Squall trying to catch Pokemon in the world of Final Fantasy VIII.
I'm not entirely sure as it's not a widely known mainstream novel to me. It might be about a final conflict on Earth, perhaps a battle between different species, ideologies or some sort of end - of - the - world - type struggle. But without reading it, it's just speculation.
A 'Final Fantasy VIII Crossover Fanfiction' could involve crossing it with the world of 'Alice in Wonderland'. Rinoa could be like Alice, falling into a strange world where everything is topsy - turvy. The Heartless from Kingdom Hearts could also be added to the mix in a crossover. The characters of Final Fantasy VIII would have to fight these new enemies, with Squall taking on the role of a keyblade wielder in this strange new world.
One idea could be Jedi coming to Earth to train a select group of humans with Force - like abilities. Another could be a Sith Lord arriving on Earth and causing chaos, and Earth's heroes have to team up with Star Wars characters to stop him. Maybe there's a discovery of a hidden Star Wars - related artifact on Earth that has the power to change the balance of the Force.