I'd omit the "who" myself. It's perfectly understandable without it. Just my two cents though.
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Jisu98And it also can be "He is not what he was." or "He is not who he was."Yes, "S/he is not what s/he was" seems more correct than "S/he is not who s/he was". The former is used in 27 books digitized by
But, the first one is better. Right? Thank you again!