WARNING! This article contains major SPOILERS for From’s season 3 finale!At the very end of From season 3, episode 10, a new supernatural figure in a yellow suit is introduced, and he appears to be the most menacing villain yet. Since the pilot episode, Froms nocturnal monsters have proven to be among the biggest threats in town, in large part because of how little was known about what exactly they were, what they wanted, and why they only attacked at night. From season 3s ending has finally answered many of these questions, but the introduction of the man in yellow adds another layer to the evil mysteries in town.

https://screenrant.com/who-is-the-man-in-yellow-from-season-3-finale/