Like her game counterpart, Sonia is quite intelligent, though a little distracted. During her trip with Goh, she proved to be a wild driver, although she doesn't admit it. In the past, she was [[Leon]]'s traveling companion, but their relationship changed as Leon became closer to Chairman [[Rose]]. This made Sonia decide to pursue her own course, far from what Leon was looking for.
During the time she was traveling with Goh, Sonia showed a good relationship with the young Trainer, including encouraging him to continue his research and indicating that he could be a Professor in the future.