I really badly want a sona like this but nothing I try ever sticks. I absolutely love this sort of design tho and I would love to experiment with it more. The sounds this monster would make would be like playing back "ghost" recordings where you think you hear voices but aren't fully sure (thanks to a viewer in my steam for suggesting that :3c)
It would be called Ghost, and it's form is limitless but usually likes to take on the form of a housecat for casual times and bigger "canine/feline" or even monster like forms for attack modes.
Ghost is very unfriendly outside of close friends, which is limited to like.. 2. Everyone gets hissed/growled at or even attacked if they get too close. Very aloof and don't approach if you dont wanna get bit.