This was done by a artist on twitter link here -> https://x.com/rei_m3i

So Just a nice close-up painting of Kugi

So details about her are that she is over 300+ years old, and she was trained in being a mother/ tactician/ martial artist with the help of Ethan's mother when she was younger.
-The Wild Kitsune trained her to be a desirable female for whoever owns the "World Key" sword that could help them return to the home realm.
-Kugi fell in love with the mortal realm and never felt an attachment to the home realm where they came from so she became an adept Kitsune where she appears more humanlike.
- When she met Ethan she was being formal and noble when meeting him and when she requested him to help the wild Kitsune he agreed to help before she made the offer of herself as a reward. She wondered if he already knew, but he said he would help with no need for a reward. This is why she fell for him for being kind and selfless she developed feelings for him.
- Since he agreed she offered to help with anything with his family, and his two wives asked for help with the kids. She became like the "Best Mom" since she was well-trained to be a mother, and took care of many children while training.
-When Lora and Eilwynn wanted Kugi to teach them to be better mothers there was an agreement. Kugi wants to be married and have a child with Ethan, and she will teach Lora and Eilwynn all the skills she knows. But she had to teach them for a few months before any relationship with Ethan.
- Later on, she will get married to Ethan, and with Lora and Eilwynn's blessing bed him, and for some reason she will have twins like Lora and Eilwynn, and yes a boy and girl as well.

Bonus info
-Ethan never wanted more than 1 wife and women in his country do have a little more power over men. So Ethan got 3 wives because they all made agreements since they all fell for him and agreed to share him.
- Kugi is the one wife who works him ragged in the bedroom, while Lora is a close 2nd, and Eilwynn is the more loving one. However, they still take the fantasy version of birth control because they found Lycanborn are very fertile beings. Ethan would have possibly 14 children without the birth control spell.