Well, in some fanfictions, Naruto and Hanabi might be transported to the Sekirei universe. Hanabi could learn new techniques from the Sekirei, while Naruto uses his Rasengan and Sage Mode to help in battles. There could be a love triangle involving Naruto, Hanabi and a Sekirei. Maybe Hanabi develops feelings for a Sekirei, and Naruto has to help her figure out her emotions while also dealing with the chaos of the Sekirei world.
One common theme is the exploration of new worlds. Since it combines Naruto and Sekirei, often Hanabi is placed in the Sekirei world and has to figure out how things work there.
Well, 'Hanabi's Sekirei Adventure' is also a notable one. In this fanfic, Hanabi discovers the Sekirei world and has to adapt to its rules. The author does a great job of portraying Hanabi's growth throughout the story. It has a good mix of the Naruto and Sekirei lore, which makes it a fun read for fans of both.
Naruto's ability to use chakra and his powerful jutsu like the Shadow Clone Jutsu could be combined with Hanabi's Hyuga clan techniques. In the Sekirei world, they might use these combined abilities to take on stronger opponents. For example, Naruto could create clones to distract enemies while Hanabi uses her Byakugan to find weak points and strike.
It might not be extremely popular. While both Naruto and Sekirei have their own large fanbases, combining them in a fanfiction in this way is a rather niche idea. Many fans of each series are more focused on the original storylines, characters, and lore of their respective shows. However, there are always some fans who enjoy exploring crossovers and unique interpretations, so it could have a small following among those who like to think outside the box in fanfiction.
A Naruto and Sekirei fanfiction crossover can be really interesting. In such a story, the different power systems from both Naruto and Sekirei universes could be combined in unique ways. For example, the ninjutsu from Naruto might interact with the Sekirei's special abilities. Characters from both series could also form unexpected alliances or rivalries. Maybe Naruto characters could learn about the Sekirei Plan and get involved, or Sekirei could be introduced to the concept of chakra.
Often, Hinata might be included. Since Hinata has a long - standing relationship with Naruto in the original series, in a harem fanfiction, she could be part of the group. Also, Sakura could be there. She has her own complex relationship with Naruto in the original Naruto story, so it makes sense for her to be in a harem setting with him in fanfiction. Another character could be Ino. She is also a female ninja who has interacted with Naruto and could potentially be part of this harem scenario.
In the fanfiction, a big challenge could be the jealousy or interference from other characters. There might be other people who have feelings for Naruto or Hanabi. For Naruto, Sakura might still have some unresolved feelings, and she could potentially cause some problems for their relationship. For Hanabi, there could be members of the Hyuga clan who oppose her being with Naruto, thinking that he is not a suitable match for her in terms of clan traditions and politics. All these factors combined would create many challenges for Naruto and Hanabi to overcome.
Naruto's chakra could potentially enhance the Sekirei abilities. For instance, if a Sekirei has a power related to speed, Naruto could use his chakra to further boost that speed. His Rasengan could also be modified when combined with a Sekirei's power. Maybe it could take on new forms or have additional effects.
One idea could be that Naruto congratulates Hanabi on becoming a strong ninja. Maybe she has just achieved a new rank or mastered a difficult jutsu. Naruto, being the friendly and encouraging person he is, throws a small celebration in the Hidden Leaf village for her. He gives a speech about how he has seen her grow and how proud he is of her progress.