In a fanfic, Naruto might power up by having a spiritual awakening. He could connect with the spirits of past Hokages in a deeper way, gaining their knowledge and some of their power. This could enhance his existing jutsu and give him new abilities. Vegeta could power up if he were to face a near - death experience against Naruto. This could trigger a hidden potential within him, like a new type of Super Saiyan form that has unique abilities. He could also fuse with another Saiyan (if there were another Saiyan available in the fanfic's scenario) to create an even more powerful being.
Ela's mother in Frozen had a powerful magical power in the fantasy world. She could control ice and snow to create powerful storms and even manipulate time and space. This kind of magic power was extremely rare in the entire fantasy world. Even ordinary humans like Anna and Olaf could easily feel Ela's magic power. At the same time, Ela also had a strong sense of self-awareness and control. She could use this power to protect herself and her sister, and even defeat powerful enemies in battle. Therefore, it could be said that Ela's mother's magic power was quite powerful and a very mysterious existence in the fantasy world.
In this fanfiction scenario, Vegeta's power might manifest in Naruto's ki control. Since Vegeta is from the Dragon Ball universe where ki is important, Naruto could start to sense and manipulate a similar type of energy. He could use this newfound energy for things like enhanced speed, allowing him to move so fast that he appears as a blur to his enemies. Also, it could be used for energy blasts, although Naruto would have to learn how to shape and control them in his own ninja - like way.
He could be initially dismissive. Vegeta has a high opinion of his own power, so when faced with a powerful female Saiyan, he might at first think she's not as strong as she seems. But as he sees her in action, he may start to respect her power. For example, if she's able to defeat some strong opponents he thought she couldn't handle.
The power level would be insanely high. Naruto already has access to a huge amount of chakra, especially in his later forms like Six Paths Sage Mode. Vegeta, on the other hand, has his Super Saiyan forms which multiply his power exponentially. When fused, they would likely have a power level that could easily rival some of the most powerful beings in both universes.
Fan Xian's strength was around the eighth rank. Although he had won the battle with Cheng Jushu easily, he had not surpassed the level of the Eighth Stage. In the battle before Fan Xian and Teng Zijing joined forces to deal with Cheng Jushu, his strength had increased. He also said that after that battle, his zhenqi had gone up another level. Fan Xian's hearing had not reached the level of the ninth-level ace Yan Xiaoyi, so he could deduce that his strength should be between the eighth and ninth-level. However, the specific level of the expert was not explicitly mentioned.
Fan Xian's strength was between the eighth and ninth ranks. Some documents believed that his strength had reached the Eighth Stage in Northern Qi, but he was no match for the ninth-level experts Yan Xiaoyi and Friar He. In addition, Fan Xian had won easily against Cheng Jushu, but he had not surpassed the eighth rank. However, after this battle, Fan Xian's strength had increased. Thus, it could be inferred that Fan Xian's strength should be between the eighth and ninth ranks.
Fan Xian's strength was above the eighth rank, but it was not explicitly mentioned whether he was eighth or ninth rank. Fan Xian's strength in Northern Qi should have reached the eighth level, but he was no match for the ninth-level aces Yan Xiaoyi and Friar He. When Fan Xian had first entered the eighth rank, he had almost been killed. Later, after experiencing many assassinations, his strength had improved. Combining this information, one could deduce that Fan Xian's strength was between the eighth and ninth ranks.
Fan Xian's strength was between the eighth and ninth ranks. Although it was still uncertain whether he was an eighth or ninth-level, Fan Xian displayed extraordinary strength in the play. It was as if he had barged into the Royal Palace at night and successfully dodged Yan Xiaoyi's arrow. However, Fan Xian's power might have an even more shocking side to the plot, so his martial arts level still needed to be observed. In summary, Fan Xian's strength should be between the eighth and ninth ranks.
Fan Xian's strength was between the eighth and ninth ranks. Whether it was an eighth or ninth-level was still uncertain, but Fan Xian had shown extraordinary strength in the play. It was as if he had barged into the Royal Palace at night and successfully dodged Yan Xiaoyi's arrow. However, Fan Xian's power might have an even more shocking side to the plot, so his martial arts level still needed to be observed.