He is a guy, obviously. The best way to find out if you arent sure is to look at the card list on tha main page. Under the cards actual description, there is a part about:
Card Pack Availability & Notes
A Prelude (Set 6 Box) ,A Prelude (Set 6 Booster)
If the said unit/character is female, there is a "(Female card)" tag too.
Something must be wrong with me. I'm giving advices to someone i should kill.