Nanako was seen during her special story quest in Kagetsu Tohya where she is fostered in by Arihiko. Just Nanako as a standalone is quite adorable since she manages to wander away from most bad things like her previous master. Nanako is as innocent as a child until she realizes she has the power to cause harm to someone in comedic way. She enjoys eating carrots and food from someone else's home.

She is a spirit combined by a unicorn and a woman, so eventually as the years pass her body will gain more characteristics to a horse, just look at her hooves which are on all of her feet. I do think it's strange but it's new to me since I've never seen someone with those. Nanako enjoys bullying Arihiko when she learns she has him under her thumb. Like when Arihiko was angry at her for eating his food.

Nanako is also quite good at playing the innocent game where she makes it appear that her master is the most violent person ever but does in fact have us under a ruse and make it seem like she's being hurt. Arihiko was forced to pair along with her since he decided to house her inside of his place. Nanako is human enough however to give off the appearance that she may be a human in cosplay clothing.

That is how Arihiko almost ended up going to jail because of his strange fetishes. Nanako is probably the most innocent character because of how she's been treated. Even in Carnival Phantasm, she's just enjoying her time in beach until suddenly a massive incoming Ciel Rams into her because of the curry. I found it hilarious because Nanako usually minds her own business and is pretty self reliant , overall a pretty good character and if you're into horses she's here.

Nanako is a devious spirit because she does enjoy framing someone, I'll give the blatant example of what she did in Arihikos home where she was stuffed inside of the closet she banged and made noises so that Shiki could hear. She's a rebellious spirit who will trounce around like the unicorn she is and partake of her free will. She also enjoys playing her good old pranks when Arihikos sister walked into the room and the horse girl yelled rape to frame Arihiko for something he would never do. To be completely honest it is a bit strange to include her in Carnival Phantasm. An inconsiderate spirit who doesn't understand how the world works, like when she appears out of nowhere and makes Arihiko look insane when he's talking to an invisible spirit, I mean her age is old but if you're into horses.