I love Sue and glad she's really killin' it but finally she hits a way. Mothra is just too big and forceful for her forcefields to stand, even when applied strategically. Mothra has this completely sewn up.
Pazuzu vs. Aang is a much trickier. To my memory, Aang doesn't do a lot of fighting spirit entities so much as having to navigate them (or in some cases helping or being helped by them). Still when worse comes to worse, Aang would stand and fight. And yeah, I'm gonna stop nerfing him with the context of the fight; going up against a spiritual antihero, he will definitely go into his Avatar state. I think he would rather talk him down but what little I see of Pazuzu, he's smart and even humane but I get some "Son Wukong" vibes, which is to say more action than talk. So this is going to be for-real fight. I think in the Avatar state, Aang will just get on his tippy-toes to equal a god and from there, the fight will determine if Aang's cleverness can overcome Pazuzu's power. Now this is when it gets tricky; looking on Wikipedia, I genuinely don't know how many of Pazuzu's problems are solved with brute force and how many are solved with cleverness. He's described as utilizing destructive winds so I'm going to say brute force.
That sounds like it should play into Aang's favour and I won't dispute that take but there are definitely entities where they simply don't fall into traps so easily because they don't mess around and charge in full force ("Everyone has a plan until they get punched in the mouth".). If Aang can take it he can put a plan into effect. My guess is it involves him having to find a way to ride the wind to get to Pazuzu in the first place. My assumption is Pazuzu will keep pushing him back with destructive winds and Aang is too smart to go "force v. force". But can he land a punch when he gets there, let alone a decisive one. The best chance is to focus on air bending until he gets close and then unload in the hopes he won't see the other elements coming. This is where I lose track, again, in large part to my lack of knowledge of Pazuzu except for "vibes". I have no doubt Aang will deliver a powerful attack, are the elements still powerful enough to reach the gods. After all this, I'm going to say Pazuzu comes out scarred but winds. That said, if anyone has info about Pazuzu or Aang that is relevant that I've missed, I'm definitely interested in listening and adjusting my guesstimation accordingly.