In a fanfiction, the aliens could capture Naruto and try to study his unique abilities. The monsters then decide to rescue him because they realize his powers could be the key to defeating the aliens once and for all. The story could involve a lot of action as the monsters infiltrate the alien base to save Naruto.
In the Monsters vs Aliens original story, a young woman is transformed into a giantess after being hit by a meteor on her wedding day. She is then taken to a secret government facility where she meets other monsters like a half - ape, half - fish creature, a gelatinous mass, and an insect - like monster. When aliens attack the Earth, these misfit monsters are the world's only hope. They use their strange powers and abilities to combat the technologically advanced aliens and ultimately protect the planet.
The main characters include Susan Murphy, who becomes Ginormica. There's also The Missing Link, B.O.B., and Insectosaurus. And of course, the alien villain Gallaxhar.
The aliens are also main characters. They are fierce and have a very different kind of biology compared to the predators. They are often shown as a horde, attacking with their sharp claws and teeth. And of course, in some storylines, there are human characters who are important too. They might be soldiers or scientists, trying to make sense of the chaos that the aliens and predators bring.
One idea could be a story where the monsters and aliens have to team up against an even greater threat from another dimension. Maybe a powerful interdimensional being that wants to conquer both Earth and the alien planets.
One interesting storyline could be the epic battles between the two species in a desolate alien planet. The graphic novels often show the unique abilities of both aliens and predators in combat.
The Missing Link is also quite popular. His brash and confident personality can add a lot of humor and action to a fanfic. He could be on a quest for glory or trying to prove himself to the other monsters.