A lot of people think that shaving actually makes your hair spiky and coarse and that once you start shaving, your hair grows a lot quicker. If this was true, balding men would all start shaving their heads! It only feels like the hair is growing back faster and thicker because 12 hours after shaving, the hair shafts (stubble) start to emerge vertically out of the follicles. If you leave the hair to grow out, it will take on its original texture and appearance.
When you shave, it only removes hair on the surface of the skin so it will not affect the colour or the thickness of the hair.