Okay so now onto Duke or Batwing.

Duke is kinda soft spoken, but when he has something to say y'all better listen in on it.

The relationship between these two I can imagine to be much like Vir and Lennir from Babylon 5. They agree on everything, complain about the actions that their fellow heroes make, and curse them out for not listening and then blaming them for not saying anything when they tried to tell them on multiple occasions what exactly is going on.  Then they will proceed to make the same arrangement for the very next week at the same time probably over a cup of coffee and a plate of alfred's cookies. (Thoes of you who've watched Babylon 5 know which scene I'm talking about.  To those who don't watch it you will regret nothing)

But their relationship would remain completely platonic and very professional.