I have my main protagonist supported by three or four main characters (one of which is a love interest) and i want to have them change over time due to his influence. Some are easy, the love interest, jealous reactions etc but im interested in making changes to their personalities etc almost like a slow indoctrination. I want to make my protagonist and the reader almost unaware of his influence. My initial approach was changing their reactions and actions taken in certain situations over time but im having trouble making this subtle, its either too obvious or doesn't quite link with the protagonist in the way i want. One supporting character for example is the strong willed hard headed sort and the idea i had for him was to have him deviate from his usual course of action by considering other options rather than just going in with what he deems best. any ideas how i can go through this transition more smoothly? Its hard to ask this question with sufficient info without giving away the story.