How can I align Axis?

I was looking around, couldn't find an answer.. I am still very new to this :P I am trying to change the axis of my character to that of the camera which is moved by a mouse, hence constantly changing axis, I would think.

Any how, I was wondering, how can I make my character axis constantly align with the camera axis? I have no script on this so far, as I have no clue how to proceed.. Thanks in Advance :)