OK, this one isn't explicit but when I first read it I thought it was obvious the character was gay. On my second reading it didn't seem quite so cut and dried, so maybe I'm projecting. See what you think.
The scenes in question come from the Peter David* Supergirl run, specifically, from the first trade. Kitty Faulkner - alter ego Rampage - is a scientist who has been framed for thieving money. She has been framed by her assistant, Christine. These next few scans show Kitty finding out what Christine has done, changing to Rampage and then attacking Christine.
So, nothing explicit there, but Kitty's words, her facial expressions and her reaction indicate to me that there is something else there. The backstory I've invented is that Kitty and Christine were working closely together, Kitty started falling for Christine and they went on a few dates. Kitty's feelings were real, Christine's feelings weren't and she was using and exploiting Kitty in order to steal the money. They are in the early stages of a relationship, they've probably slept together a few times and Kitty thinks it's serious. Kitty is definitely gay and Christine probably is.
Whaddya all reckon? Gay or straight?
*Yes, I am aware that Peter David is a bit of a prick. But I've decided I can't ignore all his work forever, and I do rather like some of it. So as long as you keep in mind that he thinks America has no racism because Obama is President, I think we'll be on the same wavelength.