The other ninja clans in Konoha could be his allies as well. Since Baruto has shown his strength and determination, clans like the Uchiha (if they still exist in the fanfic) and the Hyuga might support him. They would see him as a unifying figure who can lead Konoha to a better future and protect their interests within the village.
It could also be related to a prophecy or a pre - determined fate in the fanfic's plot. There might be some kind of dark prophecy that says Kawaki has to kill Naruto to prevent a greater evil. Or perhaps Kawaki is being controlled by an external force that has a vendetta against Naruto and uses Kawaki as a tool to carry out the murder.
In a 'baruto becomes hokage fanfic', he might face many challenges. He could have to deal with new threats to the village that require his unique skills to overcome. For example, a powerful enemy from a far - off land could target Konoha, and Baruto would need to use his advanced ninjutsu and leadership to protect it.
One common theme is friendship. Writers often explore how Himawari and Kawaki, who come from different backgrounds, form a bond of friendship. Another theme is growth. They both grow as characters, learning from each other.
Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
One possible plot could be that Gabriel, with her lazy and mischievous nature, gets transported to the Baruto universe. She then meets the young ninja students. At first, they are confused by her strange appearance and behavior. But gradually, Gabriel starts to teach them some of her own 'unique' ways of getting things done, which are very different from the ninja training they are used to. This causes both chaos and new learning experiences in the Baruto world.
One possible fanfiction could be where Baruto, a character from a different universe, somehow ends up in the Harry Potter world. He discovers Harry Potter's stag animagus form and is both amazed and intrigued. They could go on adventures together, with Baruto learning about the magic in the wizarding world and the significance of the stag animagus. The stag could guide Baruto through the Forbidden Forest, showing him the magical creatures that live there.
One common theme is growth. Both Himawari and Kawaki are often depicted as growing both as individuals and in their relationship. Another theme is acceptance. Since they come from different backgrounds, fanfictions usually show how they accept each other's differences.