Robert

If she was a Celestial Dragon she fell for Monkey D Dragon while he was still a Marine in her protection/escort detail. She may have been exiled once the government found out she was with a commoner and now in hiding with a death warrant when they realized he was of the D clan.

Since Celestial Dragons are known to despise all others, I wonder if the Yokai powers of Imu and the Elders derive from the power of Hate then. To have Love you must have a nearly as strong Hate out there.