Well, that's easy. Miyu's Kavat form was made from a Displacer Kitten mini created by the Capsule Chibi patreon, and 3D printed by Impact Miniatures.
I basically, made the ears more Kavat like, cut off the extra limbs, cut off the tentacles and made them extra tails, and gave them the stingers that Moonless Kavats are known for.
Miyu's humanoid form was made from the Female Samurai that was released by Impact Miniatures.
I took a different ponytail I took from another mini I worked on, gave her tails and ears, and even the hair ornament that mimicked the head of Excalibur Umbra.
Kukiko was made from an Anko mini from Capsule Chibi's Magical Girls Kickstarter.
Chopped off the horns, changed the hair a little, and gave her Kubrow ears and a little tail.
Korra was made from a Clan Ijin Kunoichi mini from Ninja Division's discontinued Ninja All Stars series.
I used the horns are an armature for her Kavat ears, shortened the hair, added some more to the outfit to make it look more like the Khora Warframe, and added the tail.
And for Trini, we go back to Ninja All Stars with the Clan Tora Kunoichi.
I had two of these for a custom project, so I cut off the ponytails, and made them into twin pigtails for Trini, the Kavat ears, the five arrow tails, and the rest is all paint.