Hello this is Gulshan Negi
Well, adding a 3D rigged character into a 2D scenario is possible and can be achieved by following the steps of creating or obtaining a 3D rigged character, importing it into a 2D software, positioning it in the 2D scene, animating the character, and rendering the final result. This process requires a combination of 3D modeling, animation, and compositing skills, but with the right tools and techniques, a convincing and engaging result can be achieved.
I hope it will help you.
Thanks