What should I do if the photos I take always have shadows?

It is best not to shoot the flash on the camera directly at the character, so the character will definitely have a shadow. One way is to use a standard three-person lamp or a soft box, with one on the front, 1 on the side and one on the background, and adjust the height appropriately. Another way is to shoot the flash on the camera at the reflector instead of directly hitting the person, which will be softer, and then use a soft cover or other accessories to cover the flash on the camera.