Hanger-on means a person who associates with someone in the hope of gaining some advantage. The antonyms for the word "hanger-on" are independent, self-sufficient, autonomous, self-reliant, and self-supporting. Independent means not relying on others. Self-sufficient denotes the ability to provide for one's own needs. Autonomous relates to self-governance, and self-reliant refers to being able to rely on oneself. Self-supporting means able to support oneself without outside help. All these antonyms describe the qualities of an individual who does not seek support or benefit from others and is self-reliant, self-sufficient, and independent.