there is no such thing as a positive charge. Matter either has charge or it can accept charge. Thats why it flows toward and away from. This pair we inaccurately call negatively and positively charged as if positively charged was tangible. It is not because it is an absence of something. Charge
all a positron is as an electron that has its energy removed and, can accept a large amount of energy, and thus behaves like everything else that can accept energy.
everything in this universe either accepts energy or gives it away. The only antimatter is in star trek and that should be your first clue its bs.