I thought, Gee, all the work we've done with Buffy is about being female, and how that doesn't mean that you are lesser. It suddenly struck me: If being feminine doesn't mean that your'e lesser, then liking guys also doesn't mean you're lesser. For very good reason, we've focused on the female empowerment part of Buffy, but I wondered, Did we leave something out? What if someone in high school is looking up to Buffy as a role model, and we're saying: You can't be a Slayer.
Additionally, she explains how despite the mythology dictating that only women can be Slayers, Billy's character will go the Batman route:
Batman doesn’t have super powers. He wasn’t gifted with an exotic foreign birth. So we take the Batman route; Billy is earning the Slayer mantle.
Billy will make his debut in Season 9, Issue 14. Below is Out's exclusive preview of the comic: