well he look like a human but he has white eyes
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I don't believe that Herobrine is in vanilla Minecraft. There are videos on YouTube that used the Single Player Commands mod to spawn the discontinued 'monster' (human) mob with the texture modified to look like the legendary Herobrine. The SPC command is 'spawn monster'. There are 'Herobrine' mods, but I have not looked into those.
looks like coal
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.
It depends entirely on which Herobrine mod you are using, you would have to look at the documentation that accompanies that specific mod.
A ravine is essentially a large "crack" in the surface. It is like a valley. This does not belong in the Nintendo DSi category though.