Her backstory is that she's from a private all girls' school while the other gay character in Valkyria Chronicles is a stereotypical okama who LOVES muscly dudes. I guess that's still pretty good by 2008 standards, and better than Valkyria Chronicles 2 where there wasn't even a hint of same-sex romance despite all recruitable characters having full subplots of their own in that game. They did make sure to have a dude in love with his sister though 
On the other hand VC2 did have a non-gender conforming character, a male-presenting woman who even used the male base character model though her backstory ended up being that she had been brought up as a boy by her father who had wanted a son, which seemed a bit iffy to me. Not that I should be expecting too much from dated anime schlock
