I hope we get to see more of Arthur in the next season of JLU....I thought not only as a character but as a DC figure he brought a lot to the table storyline wise. And, just for the record, I always did think he got somewhat of the shaft when they choose Hawkgirl over him as a member of the original 7, even though since JL Season 1 Hawkgirl has shown vast improvements in her personality and drive. I've always wanted to see how he would face up against all of the other heroes.
With Superman, I think its clear that Superman would give Aquaman too much respect for Aquaman to ever get mad at him. I could see Aquaman somewhat pushing Batman and GL's buttons, but I could see him getting along with Flash and Hawkgirl surprisingly well. As far as Diana goes, well - I could actually see somewhat of a love interest between the 2 of them. Both of them come from royalty....both of them feel as if they are abandoning their homes.....even though he's married and Wonder Woman is already hinted to have a relationship with Batman, it would make for an interesting little triple triangle.
Your memory is a monster; you forget - it doesnt. It simply files things away. It keeps things for you, or hides things from you - and summons them to your recall with a will of its own. You think you have a memory; but it has you!
- John Irving
"A Prayer For Owen Meany"