Yeah, looked to me like gender bent admiral, but I wasn't sure.
Well, umm... The latest doujin's been digitized and uploaded to nhentai.
Numbers: 391450/
No translation yet, but we don't need it: towards the end all of a sudden the teen admiral's genitals change from male to female as if by magic, unless dialogue gives a reason.
Now, other than that, s/he hasn't changed. But if Sessyu wants it permanent, then it very well may be the same character. Just in a few years to 'develope.'