So I’ve finally figured out how to design this synapsid Kaiju I thought of making a while back
Here’s the original art:
https://www.furaffinity.net/view/31144865/

So for this Kaiju, a specific ability I have for him (or her or whatever you choose) is that they have wing-like frills on its body, as you can see, and when they swing it forward (sorta like how the dilophosaurus in Jurassic Park opens its frills), it shoots out sharp quills that you can see are protruding from them. Also, on the tail, there are quills that, if this Kaiju swings it, the quills will fly at random direction or depends where it swings.
Also, this is one of the smaller Kaiju in my universe, so maybe around Showa Godzilla size type for a Kaiju.