He was much more different than what I had expected him to be. He was much more different than I had expected him to be. He was much more different than what I had expected him to be.
It should be "much different", not "much more different". The more idiomatic phrasing is He was much different than I expected. But if you correct your sentences by removing "more", they are all grammatical.
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It should be "much different", not "much more different". The more idiomatic phrasing is He was much different than I expected.
But if you correct your sentences by removing "more", they are all grammatical.
CJ