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How do you handle those players?

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All the Q&A seems to be focused on preflop. Is the maniax a maniac all the time? Or is he a wildman preflop and then go to more tight/aggressive as the board fills?

Also, how does he bet? Is it open after open after open? Constant or mandatory reraise? Does he ever check-raise? How does he respond to check-raises?

If he is a wildman all the time, then I would want to see some flops relatively cheaply with a decent range of hands and then start check-raising when the flop hits me. If the maniac starts cold calling when you check raise, then you have probably done what you wanted, which is to make him a little more predictable.