An alien chimera with a human twin

Deciding to go a bit extra, they allowed Rio to create the first girl, watching as he went for a simpler design this time, creating a traditional woman in a kimono, making an unnaturally young granny, y'know, those ladies in manga and anime, who are 80 or some shit but look like they're in their late 20s, never aging beyond some snow-white hair, remaining more graceful and active than vampires. Also, as is to be expected from Rio's pick, she sat at a cute 6'5 and had a big rack, with an even bigger booty and birthing hips and no concern for how they clap or shake, along with perfect skin, just like Domina and Adolpha.

Then came the bio... Rio loaded that shit up.

• Age: 138 (not immortal, but will live at least another 60 years)
• Worked as a nanny, guerrilla fighter, cowboy, and ninja
• Has acted as the hand of the clan leader, clan elder, acting clan head, and advisor, all for her Miyamama clan, a hidden hybrid clan with Native American, French, Japanese, Chinese, and Korean heritage based in Australia. The clan came from two families of the East, who were **** to run south, eventually coming across Australia and calling it home, moving to the relatively open Outback, where they regularly interacted with migrating tribes. The Chinese family had the French and Korean blood, while the Japanese one got the Native American ancestry thanks to an amazing ancestor of travellers who braved the Pacific Ocean at the cost of most of their crew. Together, they came together to survive the harsh Australian Outback, living near Uluru as they studied insects and poisons, seeing as there wasn't much else to do, and they didn't want to disrupt local cultures, whom they respected for their deep love of nature and animals. This has made them a major and unknown pharmaceutical power, responsible for many of the poisons on the black market, simultaneously selling the cures as well as the poisons themselves, along with spearheading a lot of scientific projects regarding insects and poisonous creatures.
• She knows and has mastered all the mainstream martial arts, as well as others.
• She's mastered the 10,000 poison art, making her immune to shit not even from this planet that no human's been exposed to.
• She's got a horse she's bonded to like a twin, with mythical DNA and secret ties to great horses in history, rode by grand strategists and warriors, whose semen was extracted for this equestrian bloodline. This includes: Sleipnir, Pegasus, Kelpie, unicorns, Napoleon's horse, Genghis Khan's horse, and Longma.
• At some point, her body was fused on the molecular level with a Cybertronian, making her heavier and denser, with more metal in her body than others, allowing her to shrug off bullets and daggers while moving at the same speed. One couldn't see any changes, but she's basically a cyborg.
• She's a mother to 13 successful adults she raised in different ways, a grandmother to 22 she helped care for and look after, and a great-grandmother to 53 people she's given great life advice to.
• She is the world's best blacksmith and craftsman

With the maiden complete, all that was left out was how she was included in this group, which Rio left out as requested, sitting with Domina and Adolpha as he wrote how this woman's name is Mabel, and that she was overwhelmed by Adolpha's charm before she set eyes upon Domina, leaving her loins to quiver as she realised she was falling in love all over again, quickly seducing the two to a bedroom, where she expertly took charge of Rio to help service Adolpha's cunt while she got some of Domina's monster cock. Domina and Adolpha obviously edited the interaction a bit to be this way, giggling to each other before Rio, then retorted that he'd like to see them do better, and they can see how he'll edit their bio.

The girls then took this delightful challenge as they decided to make Mabel a twin, taking inspiration from Adventure Time, which they ironically knew more about than Rio, because he added it into the bio, using the inspiration of Jake's origin to have Mabel be a twin, one stillborn, one not. The stillborn one was acquired by a travelling computer program seeking knowledge and genetic records from different worlds, buying Mabel's sister on the condition that she be the main entity spliced in this genetic Frankenstein spawn, and must retain her existence as a human, with her relations to the clan and Mabel as her sister. With the deal made, Mabel grew up as her twin was kept in stasis for three decades, finally getting unleashed when the machine had finished its project, creating a genetic Frankenstein by successfully fusing all these genes from different creatures, intelligent or otherwise, creating a genetic chimera of alien lifeforms from completely different biologies.

As promised, the twin remained the core part of the creation, having her existence as a twin and partial human reinforced to her as she was eventually dropped on Earth with some tech, in case she wanted to travel the cosmos. The machine also named this child Xena, and although she seems like a normal girl on the outside, with long, straight, black hair and an impossible rack and nice ass, she can bring out traits from countless races. A hyena out of her vagina, her chin opening as a secondary insect jaw, etc.

Xena is only 5'12, so she's taller than most people, but shorter than her twin and sister wives.

When Xena has children, the newborn will take a majority of physical and visual traits from the father, but will still have this chimeric DNA locked away and passed on. Xena's also got the IQ and knowledge that one would expect from a chimera of intelligent and sentient races raised by an AI that has toured the universe, so she's highly adaptable and remembers everything, easily reacquainting herself with Mabel and finding her place in the world.

It was on her way to visiting Mabel's new family that Xena encountered Rio coming home from work, opposite her in the train carriage. It didn't instantly click for her, but by circumstance, the two ended up talking with each other, sharing interests as they got along, eventually deducing that they were going to the same place and meeting the same people as they entered together, finding Mabel and the others dishevelled as they hastily covered themselves. Xena was then confused as Rio laughed it off, leaving Xena to believe humans were more open in relationships than she thought, pouncing on Rio, whom she had grown a liking for. It wasn't much at this point, but when she pulled out a hermaphrodite cock to rail his rebellious ass and flailing figure, she quickly started blushing around him, even as he eased her off anal ****, forgiving her without a worry.