In a fanfiction where Gaara gets the Rinnegan, his personality would experience a complex shift. Initially, he could be overwhelmed by the power and feel a sense of unease. This might make him a bit withdrawn as he tries to come to terms with it. But as he starts to master the Rinnegan, he would gain a new sense of purpose. He would become more strategic, thinking several steps ahead in battles and in diplomatic situations with other villages. His once - quiet and stoic demeanor might give way to a more calculated and far - seeing one. He would still value his relationships, but his approach to protecting them and his village would be more nuanced. For example, he might be more willing to take risks to safeguard his loved ones because he believes in the potential of his Rinnegan - enhanced abilities.
If Gaara got the Rinnegan in a fanfiction, his personality could change in several ways. He might become more introspective as he tries to understand the nature of this new power. Since the Rinnegan is associated with great power and knowledge, he could start to question his place in the ninja world more deeply. At the same time, he may become more isolated as he tries to master the powers of the Rinnegan, fearing that he could accidentally harm those around him with his new - found abilities. However, his core of kindness and protectiveness towards his village and friends would likely remain, but it might be tempered by his new power - related concerns.