I have been trying to figure out the name of an a 1990s anime. It had a spaceship with the last remaining members of an alien humanoid race and their Princess. Not quite sure about this part but I think the ship comes to Earth where it finds pilots who can pilot its giant guardian robots which also turns into spacecrafts.
I think the ship was mainly white in colour and almost shaped like a dragon. One of the robot/spacecraft pilots from Earth has a romantic relation with the Princess. I forgot why they were travelling through space but in the end, they find the ships true capabilities where it transforms into a sort of guardian for the galaxy.