I don’t think Todd is necessarily a person, but rather an entity or the personification of the “wolf in sheep’s clothing” idea. Meaning Todd was simply embodying this idea around Dennis, where in the final chapter shows the true intent behind Todd’s actions which was to make the saying “wolf in sheep’s clothing” become true. Also a lot of people believe Todd could’ve been the coyote shown earlier, but that could just be symbolism and not meant to be taken literally. Like sine life of rhetorical way of representing the dynamics between the two.
I think I’ll find my way out