Very specifically I think Gianni would love to learn more about dragons from Dany! Undoing all the stigma about them from Thedas.

More broadly, Gianni will totally jive with Dany's style of leadership; he's also very much a violence as a last resort type, and he has a lot of experience in leading a force under that ideal, with his sister of course. I think it would be fascinating to have a sort of bond between them grow out of that.