I feel like I should give an explanation on Kiki and some other stuff. It's going to be a bit of a read, but if you're wondering about her and Shantae, read the next line.

Who is Kiki?
Kiki is largely based on Shantae's monkey form (I'm not going to deny this, very heavily inspired) and strangely enough, my starbound character with the same name. A purple female Apex.
She's from Felicia's and Kimiko's world, but not from the island that Kimiko and Felicia live on. One of the reason why the forest elves can't talk to monkeys, it's because they don't exist where they live.
Kiki is me caving into the idea of a monkey oc after the Kong pack got released by Kabalmystic. As all but one monkey had no tail, it kinda bothered me to the point where I decided to make my own. I hope she's going to be as enjoyable as Felicia and Kimiko.

What is Kiki's role?
Besides giving monkeys some more love, she's actually meant to be the third and last OC I wanted to make.
Early on when I made Felicia I had the plan for 2 extra characters to be added to compliment Felicia. 
A human who was going to be Felicia's childhood friend, to be the anchor point for the human side for Felicia and the average height character.
And a wildcard, who became Kimiko. Kimiko sort of took the childhood friend idea, including the "you've grown quite a bit" joke. And took the roll of the largest character.

As Felicia got fleshed out, so did the need for a human character, she kind of became the human anchor point herself. And honestly, Felicia also is considered as a human, kind of lowering the uniqueness. 
There have been other characters interacting with Felicia and Kimiko, guest characters as I'd like to call them.

I hope this clears up some stuff explains my complex mind of things.