His friends would be in shock. Kakashi would take charge of the situation. He would gather all the information about what Naruto was doing before he disappeared. Naruto's friends like Choji and Ino would use their respective skills to help in the search. Ino could try to use her mind - reading jutsu on people who were around Naruto before he disappeared. They would all be determined to find Naruto because he is an important part of their team and the village.
Kakashi would be quite impressed by Naruto's creativity in using the clone jutsu in such an unorthodox way. He would also be cautious though, knowing that any new and untested jutsu can have unforeseen consequences. His friends from Team 7 would also start to think about how they could incorporate this new form of Naruto's clone into their battle strategies. For example, they could use the black book clone to gather intelligence or as a decoy in a more complex and unexpected way.
The Pokémon in the fanfiction would have a range of reactions. Some of the more friendly Pokémon might be curious and approach Naruto - as - Latias, thinking he's a lost or strange - looking Latias. However, the more territorial or aggressive Pokémon could see him as an intruder and attack. Naruto would then have to use his ninja skills as well as the abilities he has from the Latias form to defend himself and try to communicate that he means no harm.
His friends from Team 7, like Kakashi, would feel responsible for Naruto's situation. Kakashi would likely use his resources to find a proper shelter for Naruto. Shikamaru and the others might come together to form a sort of support group for Naruto. They would pool their resources, like money and food, and also try to cheer him up by sharing stories and jokes.
Well, in some Naruto fanfictions, the Henge technique might lead to disappearance if it's somehow corrupted or misused. For example, if a character tries to use Henge on a large scale without proper chakra control, it could cause an instability that results in them disappearing. Maybe the transformation is so extreme that it goes beyond what the normal physical laws in the Naruto world can handle, and as a consequence, the user vanishes.
Sakura might be initially suspicious. She is a smart girl and would wonder about the butler's intentions. She might keep a close eye on him to make sure he doesn't harm Naruto in any way.
Sakura would probably be both disgusted and amused at the same time. She might scold Naruto for being so unhygienic at first, but then laugh at his silly antics.
Sasuke might be initially suspicious and keep his distance. He's always been cautious, and this strange new development would make him even more so.
Sasuke, who has his own complex relationship with Naruto, would probably be in denial at first. He's seen Naruto as this strong - willed person, and the idea of him having schizophrenia would be hard to accept. But as time goes on, he would become more protective. He might train Naruto in ways to control his mind during the episodes, using his own experiences of mental discipline. As for Kakashi, he would be empathetic. He has his own traumas, and he would do his best to support Naruto, maybe sharing his own stories of dealing with difficult mental states.
Sasuke might be initially suspicious. Given their complex relationship, Sasuke would likely want to know the real reason behind Naruto's identity change. But once he understands the motives, he might respect Naruto's decision if it's for a good cause.
Sakura might be a bit confused at first. She's focused on her medical ninja training and Naruto's sudden interest in Lunney seems out of left field. But she would probably be supportive in the end, especially if Naruto could show her how Lunney's ideas could be relevant to their lives. Sasuke, on the other hand, would likely be dismissive. He has his own goals and Naruto's newfangled interest might seem like a distraction to him. However, if Naruto could prove that Lunney's concepts could help in their fight against common enemies, Sasuke might change his tune.