One example could be a fanfiction where Naruto becomes obsessed with power to the point of challenging all the great shinobi in the world without hesitation. He might seek out forbidden jutsus and train in isolation to gain more power, disregarding his friends and the village at first.
There are also fanfictions where Naruto's power hunger is a result of a prophecy. He thinks that he has to become the most powerful shinobi ever to fulfill it. So he embarks on a journey of intense training, often pushing his body and mind to the limits. He may not listen to the advice of his mentors, believing that he knows best in his quest for power.
Orochimaru is a very likely character. He has always been shown to be extremely power - hungry in the original Naruto series. He's constantly seeking new ways to gain more power, whether it's through experimenting on others or trying to obtain the Sharingan. Another one could be Kabuto. He was influenced by Orochimaru and also had a strong desire for power. He tried to absorb all kinds of powers and knowledge to become stronger. And Madara Uchiha is also a candidate. His plan to create the Infinite Tsukuyomi was mainly driven by his thirst for power and his desire to reshape the world according to his own will.
Some common themes in power hungry Naruto fanfics are power at any cost. The characters are willing to sacrifice everything, including their morals and relationships, just to gain more power. For example, they might betray their comrades or engage in dark and forbidden jutsu. Another theme is the envy of power. A power - hungry character may be envious of Naruto's natural power or the power of other strong ninjas in the village. This envy can drive them to take extreme actions. And there's also the theme of power imbalance. A power - hungry character can disrupt the balance in the ninja world, causing chaos and conflict among different clans and villages.
One common theme is the struggle between power and morality. Naruto often has to decide whether the power he's seeking is worth the cost, like sacrificing his relationships or his own values.
One popular 'naruto power hungry fanfic' could be 'Naruto: The Ascension'. In this fic, Naruto goes on a journey to gain extraordinary powers in ways not seen in the original series. He faces new challenges and enemies which force him to constantly strive for more power.
Often, Naruto in these fanfictions will have to face the consequences of his power hunger. He may lose the trust of his friends initially, which could then lead to a realization that power isn't everything. His development could then take a turn where he tries to regain what he has lost while still holding onto his new - found strength in a more balanced way.
One example could be a fanfic where Naruto pretends to be a weak genin even during the Chunin Exams. He might let others underestimate him while secretly observing his opponents' moves and strategies. This allows him to surprise everyone when he finally reveals his true power during a crucial battle.
One common theme is the exploration of new or hidden magic. Characters often seek power through discovering magic that was previously unknown or forgotten in the wizarding world. For example, they might find ancient spells or artifacts that give them extraordinary power.
One popular 'Harry Potter' power - hungry fanfiction is 'The Power He Knows Not'. It explores a Harry who discovers hidden powers within himself and how he uses them in the wizarding world. It's a great read for those who like to see Harry with enhanced abilities.
One great 'Power Hungry Harry Potter Fanfic' could be those where Harry discovers a new, powerful magic early on. For example, a story where he finds a hidden spellbook that gives him an edge in combat against Voldemort. Another might be one where he has a unique power inheritance that makes him more powerful than in the original books, like being able to control time in a different way.
Since 'adult fanfiction' often involves inappropriate content, I can't provide relevant examples. However, for 'civilians in power' in general non - adult fanfiction, it could be about ordinary people suddenly finding themselves in positions of great power in a fictional world, like a commoner becoming a king in a fantasy realm.