Object Rotation doesnt work

Could you show us your code?

you must be rotating Quaternion values, use EulerAngles.

Please reword the question, it doesn't really make sense. Just be a bit more detailed and post the code you're currently using, and this will be able to be answered pretty quickly by the community :D

So what exactly is working and what isn't? And what exactly do you expect each bit of code to do?

Your problem is probably related to using Quaternion components directly... these don't relate to rotations as we humans understand them. Try using Quaternion.Euler ins$$anonymous$$d:

 skeleton.transform.localRotation = new Quaternion.Euler(90,0,0);  // 90 degrees forward/down
 skeleton.transform.localRotation = new Quaternion.Euler(-90,0,0);  // 90 degrees backwards/up
 skeleton.transform.localRotation = new Quaternion.Euler(0,90,0);  // 90 degrees left
 skeleton.transform.localRotation = new Quaternion.Euler(0,-90,0);  // 90 degrees right

Also, are you trying to set an absolute rotation or add change the existing rotation? Currently you are overwriting which will ignore the current rotational state.

Quaternion.lerp and .slerp are for smoothing of angles in quaternion.