1) This was hilarious. Upvoted.

2) As the sort of person who prefers people err on the side of saying "ey", I think it's totally appropriate to refer to him as a him, because he's a he, because the information is available, and for the reasons you cited.

3) I don't think there's anything wrong with using 'ey' to mean 'I don't know/don't care what this person's gender is." If we're just talking about this comic, it's not really relevant.