<Snipped quote by Dawnscroll>
He's something between neutral and friendly toward Mammon. He can understand the role of Mammon and Vestec better than most, however, Mammon hasn't done a whole lot and Zephyrion thinks rather poorly of gods that sit around doing nothing.
Ull'yang is one of those such gods that he hasn't seen contribute anything of value, so while Zephyrion doesn't know whether the guy is agreeable or not he's probably to look on him with some scorn for essentially being "useless".
Either of the two could pretty easily sway Zephyrion's opinion one way or the other if they ever interact with him.
Jokes aside, useless huh? I guess Ull hasn't really socialized with the other gods as much as Zeph or Vulamera has but it's not like it's his fault. Right now, the only way Ull'Yang could interact with Zephyrion would be through his Avatar. If you want to make anything happen, it's practically the best time now since he left his self to sleep inside Cygnea while he waits for life to mature. A quarter of his consciousness though is still inside the Avatar which is currently in the Deepwood and has been training his spear arts for around 250.000 years or so, taking into account the time difference between his plane and the outside world. Basically, to put it into perspective, he went into seclusion training a little while after the creation of the Hain. All this time, his Avatar was left behind in the Deepwood while his other body was creating his plane.
So it's the best time for interactions right now since he will return his attention to his Avatar and not to his plane.