Honestly, it's not straightforward to say. The Thundercats comics have been around for a while, and the count depends on how you define and categorize them. Some might consider only the main series, while others include spin-offs and special editions.
Thundercats was indeed a comic first. The comic version laid the foundation for its success in various adaptations, including TV shows and toys. The characters and storylines originated from the comic world.
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.
One popular theme is the origin stories of the Thundercats. For example, exploring how Lion - O became the leader. Another theme could be the relationships between different Thundercats characters, like the friendship between Panthro and Cheetara. And battles against new and powerful enemies are also common themes in thundercats fanfic.
A fanfiction could explore a romantic relationship between Lion - O and Cheetara. They might start to realize their feelings for each other during a time of peace in Thundera. However, they could face opposition from some of the other Thundercats who think it might interfere with their duties. But they would have to decide if their love is worth fighting for, despite the potential challenges it could bring to the group.
They could be in a story where they accidentally swap powers. Lion - O gets Cheetara's speed and she gets his connection to the Sword of Omens. This would lead to a lot of comical and also challenging situations as they try to adjust to their new abilities while still fighting the forces of evil.
The Thundercats comic book series has been around for quite a while. It first emerged in [exact year if known], so it's been in existence for [number of years].
In many 'thundercats crossover fanfic', the new storylines that emerge are really cool. When they cross over with something like the Guardians of the Galaxy, the Thundercats' sense of honor and the Guardians' more laid - back attitude create a contrast that leads to interesting adventures. Also, the way the fanfic writers combine the powers and abilities of both sets of characters is exciting.
There might be a 'thundercats reader fanfic' that focuses on a love story between the reader and one of the Thundercats. For example, a story where the reader falls in love with Lion - O and they go on adventures together, facing challenges not only from external enemies but also from the differences in their worlds.