Is there a local method for Rigidbody.constraints?

Basically, I have a 3D world for the character to explore, but when fighting I want the character and enemy locked in plane with each other for a streetfighter-esque feeling. Since Rigidbody.constraints works to the world axis, and not the game object axis, is there any way I can make Rigidbody.constraints work for the local space of the game object?