Dead Dove:

Doppel Luka is a monster girl created by the angel scientist Promestein. Much like the Next Dolls, another one of Promestein's creations. Promestein intended for this monster to defeat the human-angel hero named Luka, the person who's existence she's based on. Doppel Luka is considered to be the pinnacle of Promestein's genetic engineering technology. Doppel Luka's gender isn't set, and can be switched between male and female at will meaning that she can can have a or a at will. She was created using DNA samples taken from Luka during his fight with a high-ranked named Cherub Wormiel, and has all of his memories and physical abilities from that time. When she takes a female form, her thinking and personality also changes to become more feminine. Doppel Luka fiercely desires to crush Luka and him, wanting to turn him into her slave and become pregnant with his seed, creating a new breed of human-angel warriors to serve Goddess Ilias, the Goddess of this world. Doppel Luka is just as strong as Luka, capable of using the same Cursed Sword techniques he has, such as "Serene Sword", "Vaporizing Rebellion Blade", or even "Chaos Death Star". Doppel Luka's appearance is also similar to Luka: short purple hair, blue eyes, smooth white skin, a brown light shirt and tan undershirt, brown gloves, and grey boots. Doppel Luka also carries her main weapon, a draining tentacle sword she's has specifically for defeating Luka, but won't hesitate to use it against others she deems a threat to her goals of defeating Luka.