Sure thing! The main characters of Diablo 3 are as follows:
- Deckard Cain, male
- Leah, female
- the Skeleton King, not sure if classifies as human but male

to summarize:
Deckard Cain is a male character and Leah is a female character. The Skeleton King is a male character as well, although I am not sure how gender works with undead skeletons.
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