Yes, it can be quite popular. The idea of Naruto in a demon lord role and having a harem with a female Kyuubi combines elements that many fans find exciting. It allows for unique character interactions and new storylines within the Naruto universe. Fans like to explore different power dynamics and relationships that deviate from the original series.
It has the potential to be popular. The concept brings together the allure of a powerful Naruto as a demon lord and the addition of a fem Kyuubi in a harem setting. It can attract those who enjoy fanfiction that takes the existing Naruto world and twists it in new and unexpected ways. However, its popularity might also depend on how well the story is written and how it develops the characters.
Well, it could be popular among certain segments of the Naruto fanfiction community. Combining Naruto as a demon lord and a fem Kyuubi harem creates a different kind of narrative. It gives room for creativity in terms of how Naruto's new role affects his relationships, the power structure in the story, and how the harem dynamic plays out. The unique blend of these elements might draw in fans who are looking for something fresh within the Naruto fanfic realm.