Sasuke would be annoyed at first. He sees Naruto's new interest as a distraction from their real goals as ninjas. But as Naruto becomes more skilled by adapting Power Ranger concepts, Sasuke would feel a bit of envy. Sakura would initially be worried that Naruto is spending too much time on this new 'hobby'. But when she realizes it's actually making Naruto more confident and better at combat, she would support him. And for the other friends like Kiba and Akamaru, they would be intrigued by the cool suits and gadgets of the Power Rangers that Naruto keeps talking about and might even want to check it out for themselves.