Keiki Haniyasushin in Wily Beast and Weakest Creature
More Character Titles
Ability to create idols
Primate Spirit Garden
"You built up this whole plan, and now you flee in the face of the enemy...! Truly the height of idiocy. Don't think for a second that I'll let you escape after you violated my sacred territory to this extent. I'll destroy your body of flesh, and build you anew from soil and water! You shall be an idol without a single flaw, told of for ages and ages to come!"
— Keiki Haniyasushin (Wily Beast and Weakest Creature Stage 6.)
Keiki Haniyasushin (埴安神 袿姫 Haniyasushin Keiki) is a god summoned by human spirits and acts as the main antagonist of Wily Beast and Weakest Creature.
Keiki debuts as the final boss in Wily Beast and Weakest Creature, acting as a force of opposition to the animal spirits possessing the protagonists.
Keiki is quite polite and doesn't fight if she can avoid it, but this attitude presented seems to mostly extend to only humans. On one hand, at first, she tries to convince the protagonist that fighting her would be against their interests. On the other hand, she also boasts of thinking no one was left to defeat her in battle and is quick to engage the possessed protagonist once finding out about the animal spirit's plan to invade and relinquish her control over the Primate Spirit Garden. However, despite her intention to liberate the human spirits and act as a venerable force, she still expresses that she was planning to cooperate with the animal spirits in a conversation with Yachie, suggesting more reasonable intent, which Yachie subsequently rejects. 
- Ability to create idols
She can craft idols, which are animated by faith directed into them. It seems that's not their only objective, as they can act as stand-ins, play with you, or decorate your home.  Wily Beast and Weakest Creature indirectly compares this ability to the creation of a goshintai. Keiki herself indirectly suggests she could do a goshintai for Reimu. 
Aside from haniwa, idols crafted by Keiki can also take the form of other objects associated with kofun burials, such as bronze bells, mirrors, swords, and magatama. According to Mayumi, anything Keiki crafts will end up with a soul inhabiting it, but Yachie Kicchou's profile contradicts this statement.
In the Animal Realm, where the strongest is who reigns and the weaklings are subjugated to them, the human spirits couldn’t compete with the strength of the beast spirits. They lived as slaves at the mercy of beasts, especially after the latter created organizations. That way, the human spirits lived in the Primate Spirit Garden, a place for them created by the beast spirits.
However, the human spirits looked for a way to get free of the beasts’ control. That way was asking and praying for a savior. After praying, Keiki was born and she told them to deposit their faith in the idols she created. They did as she told them and the idols became the true governors of the garden and they started to conquer the Animal Realm. As they don’t feel tired or sick, they were the perfect warriors. Furthermore, the beast spirits couldn’t touch them, as the idols were only hurt by physical attacks. But the beast spirits didn’t stand there with their arms crossed. They thought about a plan in which they would bring an invasion of the surface to attract a human with flesh and a body who will fight against the idols and Keiki, invasion that provoked the events of Wily Beast and Weakest Creature 
Keiki seems to be based on Haniyasu (ハニヤス), a Shinto god of soil, agriculture, and pottery. According to the Kojiki, when Izanami died after giving birth to the fire kami Kagu-tsuchi, multiple gods emerged from her bodily remains. Two gods of soil were born from her feces: a god named Haniyasubiko no Kami (波邇夜須毘古神), and a goddess named Haniyasuhime no Kami (波邇夜須毘売神). Both of these gods are often conflated into a singular entity known as Haniyasu. In the Nihon Shoki, only one deity is born this way instead, a goddess called Haniyamahime.
Many Haniyasu shrines are located in the Fukuoka prefecture, which is also known for its unique, elaborately decorated burial mounds (装飾古墳). Some of the painted decorations found in them resemble the patterns on the edge of Keiki's dress and sleeves.
Keiki's outfit is based on a variety of so-called "priestess haniwa," thought to represent clergywomen or mediums, and usually used as the basis of reconstructions of Kofun era women's clothing. Both the asymmetrical outerwear and the headkerchief Keiki wears are common features of this type of haniwa.
Her necklace consists out of magatama, comma-shaped beads produced between the Jomon and Kofun periods, initially worn as ordinary jewelry, but viewed exclusively as ritual objects and symbols of divinity in later times.
Her full name is Haniyasushin Keiki (埴安神 袿姫). Her surname is Haniyasushin (埴安神). Haniyasu (埴安) is taken from the name of the kami on which she is based, and comprises the characters for "clay" and "ease". The last character, shin (神), loosely means "god", and is present in the names of various kami throughout Shinto mythology.
Her given name is Keiki (袿姫). The kei (袿) refers to uchigi, a colorful robe that was often worn in several layers as part of a jūnihitoe, a formal dress worn by ladies-in-waiting at the Japanese Imperial Court during the Heian period and are also worn at important ceremonial functions such as weddings and enthronements. The character ki (姫) means "princess" or any lady of noble birth. Thus,Keiki (袿姫) roughly means "uchigi princess".
Keiki's design seems to be based on reconstructions of Kofun period clothing. She wears a green headkerchief, similar to these commonly seen on the so-called "priestess" haniwa, and a yellow dress and green apron likely also based on haniwa outfits. The spiral decorations on her dress are similar to paintings from some of the ornamented kofun from the Fukuoka prefecture. Her necklace consists out of a number of multicolored magatama, comma-shaped beads often used as a symbol of divinity, and described as a frequent offering for the gods in early Japanese chronicles. She also holds a variety of contemporary sculpting tools in her hands and has more in pockets at waist height.
The final boss of the game. She immediately recognizes the animal spirit that took possession of the protagonist, but wonders why it has the form of a human. After seeing that she is facing a human under the influence of an animal spirit, she sees through the animal spirits' plan, mocks it, and tries to convince the protagonist to side with her. After the latter doesn't give in (or, as in Youmu's case, thinks back and forth for too long), Keiki attacks them.
Unbeknownst to both the Protagonist and the animal spirit that took control of the protagonist, the entire conversation with Keiki was merely used to stall time so Keiki could charge up her sculpturing arts, by which every single beast spirit was defeated. Upon realizing this, the animal spirit that took control over the protagonist panics and urges them to flee, which causes Keiki to start chasing them out of the Primate Spirit Garden, the ensuing battle occurs throughout the escape through said garden, until they make it back to the city of the Animal Realm, where Keiki is then only defeated after an overwhelming force of animal spirits come to the protagonists' aid.
Mayumi was pottered by Keiki as the leader of her Haniwa army. She doesn't talk about her creation in her dialogues, but since Mayumi is clearly more elaborate and human-like than the idols they both use in their battles, Keiki seems to have made an effort with her. There's also nothing to say that she didn't give her a real personality. Mayumi shows a lot of loyalty and respect towards her.
- Yachie Kicchou and other animal spirits.
Keiki looks down on animal spirits and titles all three options with insults - Keiga (strong-teeth) have more teeth than brains, Kiketsu (onimeisters) stink, and the Gouyoku (festive spirits) have no abilities other than pride. Later, however, she converses quite amicably with Yachie, but she dismisses this matter-of-factly and sees Keiki as out of place in hell. 
Keiki does not mention Saki in her dialogue, as Saki is introduced after Keiki. However, Saki admires the goddess's strength, despite their mutual rivalry.
Keiki acts friendly towards the protagonists in the endings, and offers to craft a goshintai for the Hakurei god and a figure of Marisa.  Marisa appears to have a positive opinion about Keiki, as she isn't sure why the beast spirits hate her, and visits her domain after the events of the game.
- Keiki appears on the jewel case of Wily Beast and Weakest Creature, along with Yachie Kicchou and Saki Kurokoma.
- In the Strange Creators of Outer World interview about Wily Beast and Weakest Creature, ZUN states that Eika's title purposely ties into Keiki's idolatry theme. This might be a nod to gods they're based on being siblings according to the Kojiki and Nihon Shoki genealogies.
- Wily Beast and Weakest Creature - Youmu (Otter) Ending
- Wily Beast and Weakest Creature - Keiki's Profile
- Wily Beast and Weakest Creature - Reimu (Wolf) Ending
- Wily Beast and Weakest Creature - Marisa (Wolf) Ending
- Wily Beast and Weakest Creature - Yachie Kicchou's profile - "The idols had no flesh, soul or desire, and so the beasts were quite literally unable to lay a finger on them."
- Wily Beast and Weakest Creature - Yachie’s Profile
- Wily Beast and Weakest Creature - Marisa (Eagle) Ending
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