Keiki hanayasushin

Mayumi joutouguu:
She's have a Haniwa with blonde hair and yellow eyes, wearing a yellow dress with white sleeves, white bloomers, and black shoes. She wears two white scarves in her hair.

Reimu Hakurei:
Dark red eyes; black hair; wears large red ribbon in hair; Often carries a gohei with many paper seals attached in streamers; Has a red neckerchief; Wears a red and white dress remotely similar to a shrine maiden's outfit with detached sleeves leaving her shoulders uncovered, she have a chest sarashi behind the dress.

Marisa kirisame:
She has blonde hair,Brown eyes and a black and white witch costume, sometimes with some variations in design and sometimes in color, being very dark blue at other times. She is also very short in stature, measuring approximately 1.45 tall

Mayumi Joutouguu
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.

Minor Relationships
Saki Kurokoma
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.

Reimu Hakurei and Marisa Kirisame
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

The exact age of Keiki Haniyasushin is not specified in the provided search results, but as a character from the Touhou Project series, she is likely ancient or immortal like many other Touhou gods and youkai. while Keiki's physical age looks like 19,

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.

Keiki Haniyasushin (埴安神 袿姫 Haniyasushin Keiki) is a god who can create idols that was summoned by the human spirits of the Animal Realm. When the human spirits were being gathered in Primate Spirit Garden and oppressed by the three other organizations of beast spirits, Keiki created idols for them to put their faith and turn into living soldiers to help fight back against the other spirits.

Keiki Haniyashin is approximately 5'4" to 5'6" (165-173 cm) tall.

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.

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.