It took me a long while, but I finally decided to do a reference for my primary sona that I feel happy enough with to post!
You might have seen 'em around in a few pics, but here they are proper~

...Also I hope you don't mind if they are more than a little horribly self-indulgent in how strong they can be.
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Skai: The Taut Wind
Gender: He/Him
Skai is an anomalous Air Spirit that tends to show up wherever puffy and occasionally fluffy shenanigans are due to occur. His appearance is an omen that things are set to get HUGE in the near future.

With a bike pump-like tail, a torso covered in strange runes, and translucent gliding membranes connecting from the wrist all the way to the thigh, it almost seems as though he was MADE to swell and make others swell. Though whilst their abilities govern over air and wind, he enjoys ANY means of expansion, whether it be water, slime, food, or juice, bigger is always better~

He has a very playful, silly, and downright bouncy personality, fitting for someone who tends to be full of hot air often, but he also possesses a more dominant, teasing side that occasionally comes out.
As for where they come from?

...Well, you'll see that very soon~
Other traits include:

-Height can be anywhere from 2.5 to 4 feet tall, though usually he rests somewhere in the middle.

-Skin is far stretchier than what should be naturally possible, making him effectively unpoppable no matter how huge he becomes

-His eye-rings can either have white pupils or be hollow, depending on the mood.

-VERY strong inhale/exhaling abilities, great for puffkisses and self-inflation!

-LOVES balloons, may or may not eat them.

-Favorite food is pancakes, probably smells like them too.

-May or may not be completely hollow on the inside.

-Abnormally mobile, can move with ease even at massive scales!

Meta: Inspired mostly by Ori(Ori and the Blind Forest/Will of the Wisps) though with a more puffy elemental spin >w>