I thought Ranma has gray eyes as a male and blue eyes
as a female.

	I could be wrong on this, but in the OAVs (I think that's where I
remember it from)  I swear that male Ranma had blue eyes.  Some scene
occurs to me is Ranma beaming at Akane (shown from Akane's point of view).  
Like I said, I could be totally off, but I have a very good track record
of remembering details no one else does.