Well, in some of these fanfictions, a common storyline is the fusion of the power systems. So, the main character might combine the magic from Overlord with the chakra system in Naruto. This newfound power makes him very attractive to the female characters, leading to the formation of a harem. Sometimes, it's also about a character from one universe being lost in the other and having to adapt. In the process, they form relationships with various female characters, which turns into a harem.
In these fanfictions, Naruto himself is very common. Since it's a Naruto - Overlord crossover harem fanfiction, he is often the central male character around which the harem forms. Then there are female characters like Hinata from Naruto. From the Overlord universe, Albedo is often used. She has a strong personality and her appearance makes her a popular choice to be part of the harem.
It's also popular because it allows for a lot of creativity. Writers can explore different power - ups for Naruto, different ways of forming the harem, and various plot twists. In a 'Naruto Overlord Harem Fanfiction', you might see Naruto with unique abilities that he didn't have in the original series, and the relationships within the harem can range from love - at - first - sight to more complex, enemies - to - lovers scenarios. All these creative elements keep readers interested.
There might be a fanfiction where the Overlord's power is combined with Naruto's. For example, the Overlord's ability to control undead could be merged with Naruto's shadow clone jutsu, creating a whole new kind of combat strategy. This could lead to really exciting battles against common enemies in both universes.
In the Overlord world, Albedo could be one of the potential female characters. She is powerful and has a complex personality. In a harem fanfiction with Naruto, she might be intrigued by his different power system and his kind heart. Another could be Shalltear Bloodfallen. Her combat skills and beauty might make her interested in Naruto as well.
Another way is to join Naruto or Overlord related forums. There, fans often share and recommend good fanfiction. They might also give you some insights on which stories have the best character development or the most exciting plotlines.
One great 'Naruto Overlord Harem Fanfiction' is 'Naruto: The Overlord's Ascent'. It has an interesting plot where Naruto gains powers similar to an overlord and forms a unique harem. The story is well - written, with good character development for Naruto and the female characters in his harem.
One idea could be that Naruto is somehow transported to the Overlord world and his unique abilities draw the attention of various female characters, leading to a harem situation. Maybe his ninjutsu skills are seen as a form of magic there.
I didn't know that Overlord Lover was the name of a novel, nor did I know if there was an animation. If you can provide more information or context, I will try my best to answer your questions.
Yes, there are likely some 'Naruto is Overlord' fanfictions out there. Fanfiction writers often like to combine different popular universes in creative ways. You can try searching on major fanfiction websites like Fanfiction.net or Archive of Our Own to find such works.