Oneself (always capitalized)
Oneself denotes that part of each of us whose job and interest is to take care of ourselves and our own self interests, as well as to express ourselves freely and authentically. Whenever wanting to indicate more specifically the Oneself as that part of yourself or that part of another person, you can denote that part more clearly by using that person’s name in the word construction, as an example, Dwight-Oneself (denoting my Oneself).
Usage example: His Oneself just wanted to listen to his own heart and let it lead him.
Oneself can be further distinguished into Selfish and Express.
For a fuller description of my-me and its relationship to my-you, go to Oneself and Others.