If Naruto had Gaara's personality, the story would be very different. Naruto is usually outgoing and boisterous, while Gaara is more reserved and initially cold. With Gaara's personality, Naruto might not be as quick to make friends. He'd be more guarded and less likely to trust others easily. This could change his relationships with characters like Sasuke and Sakura. His interactions with the villagers would also be different. Instead of trying to gain their approval through big shows of strength and determination, he might keep more to himself, which could slow down his journey to becoming Hokage.
Well, in this fanfiction scenario, Naruto having Gaara's personality would mean a much darker and more introverted Naruto. Gaara's personality was shaped by his lonely and traumatic childhood. So Naruto might not have that same drive to prove himself to everyone. He could be more focused on self - preservation rather than protecting the village at all costs. His bond with Jiraiya might also be affected as he might not be as receptive to Jiraiya's teachings. And in battles, instead of using his usual enthusiastic and sometimes reckless fighting style, he'd be more calculating and cold - blooded like Gaara.