Hello, I hope I'm not becoming a nuisance for answering instead. Asahiro doesn't speak a lot here so I hope I can help you a little bit. (It would be even better if she saw this and could correct me if I got something wrong about her characters)

From what I get, having investigated and admired her art for quite a long time, most of her characters are female, except from Helio www.pixiv.net/fanbox/resources… and sometimes the gender-benders of the girls..? I think.
Like Mirela here. twitter.com/asahiroalgl/status… Usually she is female but here looks male. 
And Rolando here. twitter.com/asahiroalgl/status… (still I'm not quite sure that these are gender-benders or just the girls with short haircut and I don't understand Japanese to read the comments )

Also, Rolando is female but seems to cross-dress (you could say she is a tomboy or sth). You may got confused because many times Rolando is drawn with her pirate clothes (and binded chest) and her red dress at the same time, like she is two different people and interacts with..herself. Like in this picture.    They are both Rolando.
Mirela(Rolando's twin), Lana, Maria, Allie and El are female too.

You can get more info about her characters if you buy her picture books and visit her pixiv fanbox here www.pixiv.net/fanbox/member.ph… some pages are in English too.

Hope I helped a little with this mini introduction~ Have a nice day! ^^