Well, in Naruto lycan bloodline fanfiction, the idea of a lycan bloodline being a hidden or rare bloodline within the Naruto universe is really cool. It could lead to a whole new set of clans and rivalries. Maybe there are clans that hunt those with the lycan bloodline, or clans that protect them. And the lycan characters might have a special connection to nature, like how some Naruto characters have an affinity for certain elements.
The lycan bloodline could give a character more animal - like features. For instance, they might have pointed ears, sharp teeth, and a more muscular build. Their eyes could also change, perhaps becoming more yellowish or having a different shape, like a wolf's.
Obviously, Naruto himself as the lycan. Hinata could be one of the harem members as she has a long - standing crush on Naruto. Sakura might also be part of it, adding some tension due to her previous relationship with Sasuke. Then there could be Ino, who is strong - willed and could have an interesting dynamic with Naruto in this context. And Tenten, with her skills, could also be a part of the harem.
Sasuke could also be a main character in this fanfiction. He might be interested in the power of the lycans, seeing it as a way to gain more strength for his own goals. His brooding nature and his search for power could lead him into the lycan underworld, where he has to make choices about whether to ally with the lycans or use them for his own purposes.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, including many lycan Naruto ones. The search function on AO3 is quite useful, allowing you to filter by tags like 'lycan' and 'Naruto' to find exactly what you're looking for.
There are also fanfictions where a bloodline is created through some sort of experimental jutsu. For example, a bloodline that allows the user to transform into different elements at will. This would give the character an edge in combat as they could adapt to any situation by changing their form.
Well, a frequent theme is the clash of different cultures. Naruto has its own ninja - based culture, and vampires and lycans have their own mythologies. So, in these fanfictions, there's often a struggle to reconcile these different cultural aspects. Also, themes of friendship and loyalty are common. The hybrid characters usually have friends from different backgrounds, and they have to maintain their loyalty in the face of various challenges. It's all about how these different elements interact with each other.
One possible plotline could be a lycan Naruto having to protect his harem from a powerful dark force. The lycan abilities add an extra layer of strength and mystery to Naruto. Another could be about Naruto trying to balance his relationships within the harem while also dealing with his lycan nature, like how his lycan instincts might affect his interactions with the different characters in the harem.
One interesting concept could be the combination of Naruto's ninja world with the lycan underworld. It might introduce new powers and dynamics. For example, a lycan character in the Naruto universe could have unique fighting styles that blend their lycan abilities like enhanced strength and speed with ninja techniques.
One challenge could be the cultural differences. Naruto is from a ninja world, and the lycans have their own unique culture. Understanding and respecting those differences while still leading effectively can be tough.