(MAJOR SPOILERS)

During the Exile, Kei hounds Gryphon for decade after decade, long past the point at which it's pretty obvious to every major character who knows the both of them that Gryphon is not, in fact, the Butcher of Musashi. In the course of that pursuit, she's perfectly okay with destroying a lot of lives: much of Gryphon's Starfleet crew, etc.

Granted everyone's eventually reconciled, a new generation is born, and so forth. But I can't help feeling as a reader that, dammit, between her instant loss of faith in someone she's loved for centuries, her obsessive seeming need to hate him long after there's been at least some hint of his innocence, and the death and destruction she leaves in her wake that's probably greater than the actual Butcher's, Kei does not deserve forgiveness or love. That's just a personal reaction, of course.