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.