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Wait...Gunko has some memory of Brook but I don't believe that Brook is her father, probably it is the past captain of Brook (the one died from epidemic) is the father. Gunko and Brook's captain is quite similar. But I am very confused because Brook died 50 years ago, if Gunko is the daughter of Brook's captain that made her more than 50 years of age. Gunk doesn't look like 50, probably it has something to do with her power or experiment was conducted to her because her memories are not totally intact because she only remember Brook now.