Perhaps a new acquaintance that she thought was a friend. They might be secretly working for an enemy and betray Cheetara to get information or to cause chaos in her world.
It could be her rival within her group. Maybe they're jealous of Cheetara's skills or popularity, so they betray her to gain an upper hand.
There's also the possibility that an old mentor betrays her. The mentor could have turned to the dark side for some reason, like power or revenge, and decides to use Cheetara's trust against her.
In a 'cheetara gets betrayed fanfiction', perhaps her closest friend reveals her secrets to her enemies. This could lead to her being in great danger as her foes now know her weaknesses. She might feel isolated and have to struggle alone to overcome the situation.
Naruto would probably be very curious about Cheetara. He'd be asking her all sorts of questions about her world and her powers. Cheetara, on the other hand, would be cautious but also intrigued by Naruto's energy. They'd likely start off with some small exchanges, like Naruto showing off a simple ninjutsu trick and Cheetara demonstrating her speed. As time goes on, they'd become more comfortable with each other and start to joke around and support each other in different situations.
Yes, it can be quite popular among fans who enjoy crossover romances. Naruto and Cheetara are from different fictional universes, which makes their potential relationship in fanfiction very interesting. Fans like to explore how characters with different backgrounds, powers, and personalities interact and fall in love.
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.
Another way their powers could combine is through their energy sources. The chakra that Naruto uses and the energy that Cheetara has within her could be merged in some way. Maybe Cheetara can use her connection to the spiritual energy in her world to enhance Naruto's chakra. This would allow Naruto to perform new and more powerful jutsu, while Cheetara could gain some of Naruto's resilience and physical strength in return.
Maybe in the fanfiction, Cheetara discovers a strange portal and ends up in the Naruto universe. Naruto is initially suspicious but soon realizes she's not a threat. Cheetara is intrigued by Naruto's chakra and his ability to use ninjutsu. They start training together, with Cheetara teaching Naruto some of her speed - based combat techniques and Naruto showing her how to manipulate chakra more effectively. As they face various threats in the Naruto world together, their bond grows stronger.
Maybe in the fanfiction, Cheetara discovers a strange portal and steps through it, only to find herself in the Hidden Leaf Village. There, she meets Naruto and they start training together. Naruto teaches her some ninja techniques, and in return, Cheetara shows him how to better control his speed. They then enter a tournament together, using their combined skills to win.
I haven't actually read this specific fanfiction, but generally, a story about someone being awakened by a kiss often involves themes of love, surprise, and new beginnings. Maybe in this fanfiction, Willa was in some sort of slumber, either physical or emotional, and Cheetara's kiss was the catalyst to bring her back to full awareness. It could also imply a deep connection between the two characters.
Another idea is that Naruto, while on a mission, stumbles upon a portal that leads him to the world of the Thundercats 2011. There, he meets Cheetara and they form an alliance. They could face off against common enemies like powerful villains from both universes who are trying to take over both worlds.