How big is Planet Nine expected to be?

Could you please elaborate on the predicted size of Planet Nine? Is it comparable to the other known gas giants in our solar system, or is it significantly smaller or larger? Scientists have been speculating about its existence for quite some time now, so what are the latest estimates regarding its size, and what factors have contributed to these predictions? Additionally, how does the potential size of Planet Nine compare to the other potential dwarf planets and asteroids that are believed to exist in the outer reaches of our solar system?