The YF-19 "Bird of Prey" is a prototype variable fighter from Macross Plus, not a human character. It is one of the two advanced experimental aircraft competing in the New Edwards Test Program, designed for superior speed, agility, and combat performance. Piloted prominently by Isamu Dyson, the YF-19 becomes central to the story’s test rivalry and later conflict, symbolizing cutting-edge military technology and the risks of pushing innovation beyond safe limits.