

So Jezlynn's odd condition is partially a plot device in that she cannot understand who she was with no memory, so as she searches for her former crewmates, she is also searching for her own identity.
In truth, another ship threatened to finish the Constant’s destruction. Its chief officer demanded payment. A desperate and enraged Morgan beat Jezlynn insensible believing she knew there were ship repair components onboard, ignoring her claim none existed. Since no wealth existed on the crippled ship, Morgan traded crew members to be sold as slaves to save the ship. Jezlynn was one crew member traded since she probably wouldn’t survive. Just in case she did, and to prevent any possibility of her relating what happened onboard, before leaving the ship she received a huge dose of diamine, a dangerous drug known for slowing aging but destroying the mind. Two years later Jezlynn escaped from slavery, but by then her mind held six different personalities, and she had no memory of her past. Her reputation was ruined, and Morgan Dachs' protectors made sure her future was destroyed. By then Morgan was also using disamine in what he believed were safe dosages. Later he becomes the obsessed, deranged, stalker-villain of the series as shown in Devil's Due, the story where the truth becomes known.
I think readers realize from reality what the wide range of personalities exist and the length some individuals will go to achieve what they think they want, often influenced by their childhood and experiences, their genetics and overall mental health. Some do wondrous good, others unfathomable evil. As writers, we often exploit these characteristics in our characters to entertain our readers and to sometimes show how people can change and grow.
Please visit the following author's to see their take on odd characters:
Skye Taylor
Victoria Chatham
A.J. Maguire
Dr. Bob Rich
Connie Vines
Diane Bator
Beverley Bateman
Fiona McGier
Judith Copek