Is there a word for someone who does not wish to change the sex they are, but thinks that the gender that goes with that sex is too limiting? I suppose if that person is female, the word might be feminist, but that doesn't really work with a man, particularly if his feelings are mainly to do with the male sex.
So - trans - wishes to be thought of as the opposite sex/thinks that they are the 'opposite gender'
'Cis' - happy with their sex and the gender that 'goes with it'
What is 'wants to be the sex they are but not be limited by it'. Apart from 'normal'!