If I created a game character using Blender and it is rigged using the bones, lets say the bone was sticking out of the game character. if I exported the entire model to Unity, would the bones be visible at all?
Bones used in rigging are not normally visible in any end product, be it a game or animation or whatever. Most (all?) renders and game engines will not render them in the final product, although you may see them in the editor for the game engine (e.g. unity editor while making the game, but not the actual game itself).