Whom does Victor imagine seeing on his way to his house?

I would assume this would be the monster. Do you have a specific chapter for this question?

probably around chapter 7 or 8

Victor is moved to tears at the site of his native city, since his estrangement from it has been so prolonged. Despite his joy at being reunited with Geneva, his fear returns. He arrives at night, in the midst of a severe thunderstorm. Suddenly, a flash of lightning illuminates a figure lurking among the skeletal trees; its gigantic stature betrays it as Frankenstein's prodigal creature.