Why does it have to be a female character?
Or why they had to do a marriage since it's not only not been Trek's forte but also how the wedding fluff had no part of the actual movie. They could have any old guest aliens, sentient cabbages (since nobody's going to use anthropomorphic carrots), and nobody would care any more or less.
Or was Shinzon going to destroy Earth and then after being victorious there hamper the honeymoon because the Romulans shat on him his entire life? (It's like they tried to make a movie revolving around the ramming scene. Which is a great scene but everything leading to it is far more an uncoordinated mess than many of my posts!)