Oh! You know what no one's mentioned...Chrona could be both female and male! Maybe he looks female on the outside but is male on the inside or vice versa. That would also prevent periods and Chrona wouldn't be able to have children. It could also be that Medusa prevented Chrona from getting certain hormones to stop puberty if Chrona was a girl and Medusa didn't want him/her to have children.
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