2D Sprite in a 3D Game

Hey Guys,

I am working on creating a 3D game with unity using 2D sprites as some of my players. I have them automatically "billboarding" towards the camera. Once in the scene, do they behave pretty much like a regular 3D object would? Can I use Vector3's or normal 3D rigidbodys on them?

does anyone have an example game that does this that I could look at?

Hopefully I am on the right track.

Thanks guys..