Urouge is a bit of a sore thumb among the Supernovas.
The only thing people can get on this dude is that he probably has a connection with Enel since they are both Berkians.
So either Urouge escaped from the destruction and wants revenge on an antagonist that Luffy has already pummeled several arcs ago or Urouge was a subordinate of Enel that is now hunting Luffy while also picking random fights.
Neither of those sound all that appealing. Heck, with his Pre-TS bounty being so small, Urouge either has no interest in notoriety (why is he a pirate then?) or he was the most recent Supernova to become a pirate (almost like his boss recently went on a vacation to the moon or something).
As far as I can see, Urouge does not have much hope. Urouge's character choices are;
1) He is a man wanting revenge against a foe Luffy defeated Pre-TS.
2) A man hunting Luffy down cause Luffy beat up his God.
3) A man following Luffy because he believes Luffy is his new God.
4) A man who wants to become God by becoming Pirate King.
5) A man sailing around for shits and giggles.
Last one is most positive, second last is tolerable, rest are abominable.
Urouge could literally pop up anywhere in the story. He would probably come back at the same time Enel presumably returns.