Geolocation:

I don't think they have to live anywhere in particular

Age

15-25 probably? Although Fire Emblem Gaiden is kind of a kids' game I don't think any kids are playing a 30 year old game.

Gender

I suppose the audience of video games in general tends to be male, but I'd rather not cater to them in particular. The idea that video games are a "boys' hobby" should be abolished anyway.

Other

People who play Fire Emblem and are also weird enough to play Gaiden