This version of Austin is from an alternate reality where his powers managed to surpass even that of the first omni king, Zeno. But unlike Zeno, Austin actually became omnipotent.

(There's actually a video on YouTube that proves that Zeno isn't omnipotent).

It is unknown how this Austin or his reality came to be. All is known is that he stated that non of  the Ikara created it. This version of Austin is shown to be very calm in most manners. Unless he's dealing with someone who seems to be giving him trouble then he'll show other emotions as well. Never the less this Austin is very peaceful And kind at times.

Regular Austin and Demon God Austin meet their omni king counterpart.

Austin: Jesus Christ you are a lot taller than you look.

Demon God Austin:.............you have the life I wish I had.

Omni King Austin: oh what's your's like?

Demon God Austin: it was ruined by an asshole named Ikara (14).

Omni King Austin: oh.