Human-carrying birds have been built.
Piloted ornithopter: https://www.youtube.com/watch?v=a-qS7oN-3tA
Human-powered ornithopter: https://youtu.be/0E77j1imdhQ?si=Dd5hLla27Pz8gJNe&t=100
Also, Quetzalcoatlus northropi could've been powerful enough to carry a human.