Theory!!!
I think the Gluttony Rakshasa is his father beacause you can clearly see his human form and will reading I thought about his father who “gave him” to the Gluttony in the flashback.
Maybe the Gluttony took is father body or perhaps he made a contrat with him and take refuge inside his son… something like that.
I wonder if the Gluttony Rakshasa will wake up and save Han Maru ? I hope so !!
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1st the ml killed mc father who turned into a zombie, 2nd like the com below me said mc killed is own father but by accident or not maybe ?
I saw someone said it's Teach fault that his father died