jogoro furuya is the grandfather of chihiro furuya and mero furuya . he is the original creator of resurrection potion. altough his past is mystery, it is hinted that he  is zombie since he will occasionally eat hydrangea leaves to keep his body from developing rigor mortis, he seems to fear his pasy a lot because he shows signs similar to dementia resulting from resurrection concoction after he was bitten during his scientific researches , he proves to have knowledge on the ´´resurrection´´ 