Sasuke would likely be very angry. He'd be determined to find out who did this to Naruto and seek revenge. He might also feel a sense of guilt if he wasn't there to protect Naruto when it happened.
His other friends like Shikamaru would start strategizing. He'd think about how to get Naruto to safety and also how to deal with the situation in terms of the possible threat that caused the injury. He might also try to keep the other villagers calm while they figure out what to do.
Sakura would immediately rush to his side. She's a medical ninja, so she'd start trying to heal the wound as best as she could. She might be in a state of panic but would try to stay focused to save Naruto's life.
He would be heartbroken. Naruto values friendship above almost everything. At first, he might not believe it and try to reason with his friends.
Naruto would be extremely hurt. He values his friends above almost everything, so their betrayal would be like a knife to the heart. At first, he'd probably be in disbelief and try to reason with them. When he realizes they won't listen, he might become angry and lash out. But deep down, he'd still hope to win them back.
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.
Sakura would probably be very angry at Kurenai. She's protective of Naruto and would demand an explanation. She might even try to heal Naruto right away if it was a physical injury.
Sakura would be furious. She's always been protective of Naruto in the original Naruto series. In the RWBY fanfiction, she would probably start her own investigation to find out who was behind the betrayal. She might even challenge the RWBY characters if she thought they were involved. Kakashi, on the other hand, would be more calm and collected. He would try to analyze the situation rationally and figure out the best way to help Naruto.
Sakura might be initially surprised but would probably be supportive. She has always cared about Naruto's happiness, so as long as he is happy with the elf, she would be okay. Kakashi, on the other hand, would likely be intrigued. He's seen a lot in his life, but an elf - ninja union would be something new. He might offer some sage advice based on his own experiences with different cultures.
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.
Sakura might be initially shocked and heartbroken. She has been Naruto's friend for a long time, and his sudden departure would leave a big hole in her life. She might try to convince him to stay at first.
Hinata would be heartbroken. She has always loved Naruto deeply. She would probably be in a state of shock at first and then mourn for a long time. She might also try to keep Naruto's legacy alive, perhaps by teaching his ideals to the next generation of ninja.
Sakura would probably be a bit skeptical at first. She might worry that Naruto is getting distracted from his ninja duties. But once she sees how passionate he is, she would support him and might even help him with his training regime, using her medical knowledge to make sure he's in top physical condition for racing.