'Hunter X Hunter,' why do characters in the series have differing pronouns when referring to Alluka's gender, with some using 'he' and others using?

In the anime series hunter x hunter 2011 characters there is notable confusion surrounding the character Alluka's gender. What makes this puzzling is the inconsistent use of pronouns by various characters in the series. Some refer to Alluka as male, using "he/him" pronouns, while others use female pronouns like "she/her."

Hunter X Hunter, why do characters in the series have differing pronouns when referring to Allukas gender, with some using he and others using?
'Hunter X Hunter,' why do characters in the series have differing pronouns when referring to Alluka's gender, with some using 'he' and others using?
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