Nah, it needs to be generic as far as gender goes in my opinion. I've seen the trailer with the Giants, got no clue. Maybe our version of gender doesn't apply to them?
"Tii is the overseer of odd and even numbers and the giant who manipulates all matters numerical. Unlike the other giants, Tii is neither male nor female. Or both male and female. It's either really simple or really confusing, depending how you look at it. Some reckon this is why Tii seems cold and distant. They are incorrect. Tii is merely calculating prime numbers. It's distracting."
From an editing perspective, according to the Chicago Manual of Style, it's now acceptable to use "they" in place of "he" or "she" (or "he/she") for an individual in the singular. If Tii is genderless, then "they" is definitely okay! :)