Not exactly sure what you are planning. Did you consider that it is a 2D image? The Reflections would be completely invisible as they would be directly behind the character...
Unless the Mirror effect is supposed to be at an angle. In that case, if you do figure out how to create the effect I suggest you don't make the angle of the reflection too much otherwise it would look strange, since the character's reflection wouldn't make much sense at too much of an angle.