Sonia fits well here. Her name, after all, means wisdom. It's hard to see her as a guide sometimes, though. She's often confused and doesn't seem to comprehend what's going on, at least before Siberia. But when she's alone with Raskolnikov at her place, she's all about the wisdom. She tells him to get down on his knees and beg forgiveness publicly, and to turn himself in to the police. Like a good guide, she follows him and makes sure he does it. And it turns out for the best.