Sorry, I couldn't find anybody by that name. Is he a minor? Typically, minors aren't listed in our database.
Mike Erwin is the name of the voice over actor from the game Jak and Daxter.
Since it is a video game, in the Playstation reviews it doesn't specify how tall...
I do not believe there is a specific reason.
At this time there is no plans for a JAK 4, but you never know.
I can't find a list of the monsters from the game, but here is the wiki page...