no
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It depends which mod you are using. There are many different mods that add Herobrine into Minecraft, you'd have to look at each specific mod to see.
The great myth of Herobrine is hard to defeat. He can break through any type of block and he is apparently in creative mode able to spawn block.
you can't.
Download the mode or change the play mode to creative.
there is not a creative mode on xbox minecraft but im shure if you ask notch he might add it