She is a hard-nosed military woman assigned to rescue Sleepers from Earth and eradicate the Blue. While doing her duty she falls in love with Yuji, a Sleeper she saved.
Marlene Angel has a complete character development and goes through significant changes throughout the story. At first she is a stoic warrior but as the story goes on and she develops feelings for Yuji, she becomes nicer and displays emotions she wouldn't in the beginning of the series.
She does fall in love with Yuji and shows great care for him. She even tries to bring him back when he is too influenced by the blue and his personality changes for the worst.
Blue Gender: The Warrior
A movie adaptation of the Blue Gender anime. It contains scenes from the anime along with new scenes and alternate story to the series.