If Amy was Goku's sister in the Sonic X Dragon Ball crossover, it would definitely add an interesting dynamic to the story. Firstly, Goku and Amy would share a deep bond as siblings. They would constantly support and protect each other on their respective adventures. Goku's carefree and naive nature would contrast with Amy's more cautious and serious personality, creating a unique dynamic between them. Secondly, this new connection between Amy and Goku would have a significant impact on their relationships with other characters. For instance, Vegeta, Goku's rival and fellow Saiyan, would now have a different perspective on Amy. He may initially see her as a potential threat due to her Saiyan bloodline but would eventually come to respect her as Goku's sister and potentially form an unexpected bond with her. Additionally, Amy's presence in the Dragon Ball world would likely influence her involvement in fights and battles. Amy is known for her determination and fierceness, although she is not as powerful as Goku, Vegeta, or other main fighters. However, being Goku's sister might enable her to tap into hidden Saiyan powers, increasing her abilities and making her a formidable warrior in her own right. Moreover, the introduction of Amy as Goku's sister could lead to interesting storylines and character developments. For example, Amy's unwavering love and protectiveness towards Goku would not only strengthen their relationship but also motivate her to train and become a better fighter to support him. This could potentially lead to her unlocking new powers and transformations, such as Super Saiyan. Overall, if Amy were Goku's sister in the Sonic X Dragon Ball crossover, it would add depth to the characters and create new opportunities for storytelling, character growth, and thrilling battles.