
I was a very manipulative child but people started resenting it immensely as I grew older. It was a struggle to learn subtle manipulation tactics to replace my heavy-handed ones but now I have sort of a personal rule (aimed at sustainability) of using only subtle manipulation, except in emergency situations.
My favorite subtle manipulation that I use multiple times a day is to refer to people by what I want them to be to me, e.g. friend, lover, colleague, etc. I learned this when I was taking a swimming class that also had a very small diving component. The diving coach only came one day to work with us. We were all beginners but he had us circle around and said, "Hello divers." The rest of the session whenever he wanted to get our attention, he addressed us as divers. It seemed weird at first, because I had never had any formal training in diving so I didn't feel like I deserved to be called a diver. It didn't seem totally inappropriate given the circumstances, however, and there was something about him always referring to us as divers that made me think that I was a diver, or at least that I was capable of being one. I saw what I was doing as not just messing around, but taking the first steps on the path to becoming a diver. I continued to think about myself in that context for the rest of the session, unconsciously trying hard to live up to the expectation that he set for us of being "divers".
Since then I started calling people by their title. When I greet people that I like and want to be loyal to me I say, "hello friend," or "hey buddy." As long as the person does not actively hate me, referring to them in this way causes them to behave more friendly to me, no matter how close we actually are (or aren't). I like to call my bosses "boss" because it subtly strokes their ego without seeming sycophantic. I even call my relatives by their relation to me, particularly if I need to somehow leverage that sense of blood to get something from them. It gives everyone a sense of security, a sense of concrete position and value in the world. They're grateful to you for this, and they also feel that you "believe in them," particularly if the title you are referring to them by is somewhat aspirational, e.g. "tax expert" or "plumbing guru." Try it, I think you'll like it.
Any other favorite subtle manipulation tools?