Well, if Naruto used mana in fanfiction, his combat style would likely become more diverse. His signature jutsu like Rasengan might incorporate mana elements, making it even more powerful and perhaps having additional effects such as mana - based explosions or the ability to disrupt an opponent's mana flow.
In Xianxia novels, the concept of true qi and magic power often appeared. They usually referred to a type of energy or power that could be used to cast spells or attack enemies. However, they were not equal.
True Qi was the energy accumulated by cultivators through cultivation and other means that could be used to improve the ability to cast spells. Magic power was the energy contained in spells learned through cultivation or special spell books. Thus, there was a difference between true qi and magic power.
Spirit power was also a type of energy or power that was usually used to describe a character's cultivation and potential. Spiritual power could be improved through cultivation and absorption of natural energy. It could also affect a character's appearance, ability, personality, and other aspects. In some novels, spiritual power was also used to represent a character's spiritual aura, which was the mysterious power he or she possessed.
One of the great Danmachi fanfics is 'A Different Perspective'. It offers a fresh take on the characters and their relationships within the Danmachi universe. The story delves deeper into the backstories of some minor characters and makes them more significant. Another good one is 'The Unseen Adventures'. It takes the characters on new quests that are not in the original story, adding more excitement and mystery.