One idea could be to have the Thundercats arrive in the Avatar world. Maybe they land near a Water Tribe. The Thundercats' advanced technology and unique abilities would be a shock to the Avatar world. Lion - O could form an alliance with Aang. They could learn from each other's leadership styles. The Thundercats could help in the fight against the Fire Nation with their strength and weaponry.
The crossover could start with a strange portal opening between the two worlds. Naruto characters like Sasuke might be intrigued by the bending abilities in the Avatar world. He could try to learn firebending, thinking it could enhance his own fire - based jutsu. And the Avatar characters could be equally fascinated by ninjutsu.
One possible fanfiction could be about Naruto characters finding themselves in the Avatar world. For example, Naruto's determination and never - give - up attitude could be a great addition to the Avatar universe. He might learn bending techniques in a unique way, perhaps by combining his chakra control with the flow of chi in the Avatar world. This could lead to some really interesting battles and character interactions.
Aang could be a great crossover character. Since he is from the previous Avatar cycle, his different approach to bending and his more laid - back personality compared to Korra could create interesting interactions. He could offer her wisdom from his own experiences as an Avatar.
A possible conflict could be a misunderstanding between the two groups. The Thundercats' brash and direct approach might be misinterpreted by the more diplomatic Avatar world. For example, when Lion - O first meets the Earth Kingdom leaders, his eagerness to solve problems with force could cause tension. This could lead to a series of events where both sides have to learn about each other's cultures to avoid all - out war.
One idea could be a crossover between Avatar: The Last Airbender and Harry Potter. Imagine Aang and his friends attending Hogwarts and learning magic alongside wizardry students. They could use their bending skills in magical duels.
In a battle situation, the interactions would be really exciting. The Voltron team is used to working together in their lions, but in the Avatar world, they would have to adapt to fighting alongside benders. Lance might team up with a firebender and use his sharpshooting skills along with the firebender's attacks. The Avatar could also be in the middle, using their all - four - element powers to support both the benders and the Voltron pilots.
One idea could be to have the Voltron pilots end up in the Avatar world. They could learn bending techniques and use their Voltron skills in combination with them. For example, Keith's swordsmanship might blend well with waterbending moves in a fight.
Another possibility is a crossover of the settings. The Camp Half - Blood could be merged with an area from the Avatar world, like the Air Temple. Demigods and benders would have to learn to co - exist and use their powers together. Maybe Percy could learn water - bending techniques from the water benders to enhance his control over water, which is already one of his powers. And the Avatar could learn about the Greek gods and use that knowledge to gain an edge in his battles.
One idea could be that Gaara, with his sand - controlling abilities, arrives in the Avatar world during a time of great turmoil. He could team up with Aang and use his sand to help in battles against the Fire Nation. Maybe his sand could also be used in creative ways to counter the bending of the various elements in the Avatar universe.